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Finding the Fourth Proportional to 206,978.72, 310,507.68 and 66,699.68

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Solution

The fourth proportional to 206,978.72, 310,507.68 and 66,699.68 is: 100,062.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,978.72 : 310,507.68 = 66,699.68 : x
  2. Step 2: Convert to fraction form
    206,978.72/310,507.68 = 66,699.68/x
  3. Step 3: Cross multiply
    206,978.72x = 310,507.68 × 66,699.68
  4. Step 4: Simplify right side
    206,978.72x = 20,710,762,893.54
  5. Step 5: Solve for x
    x = 20,710,762,893.54/206,978.72
  6. Step 6: Final answer
    x = 100,062.28

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