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Finding the Fourth Proportional to 421,419,978.44, 631,842,657.34 and 213,757,959.25

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Solution

The fourth proportional to 421,419,978.44, 631,842,657.34 and 213,757,959.25 is: 320,491,205.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,419,978.44 : 631,842,657.34 = 213,757,959.25 : x
  2. Step 2: Convert to fraction form
    421,419,978.44/631,842,657.34 = 213,757,959.25/x
  3. Step 3: Cross multiply
    421,419,978.44x = 631,842,657.34 × 213,757,959.25
  4. Step 4: Simplify right side
    421,419,978.44x = 135,061,397,000,095,440
  5. Step 5: Solve for x
    x = 135,061,397,000,095,440/421,419,978.44
  6. Step 6: Final answer
    x = 320,491,205.71

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