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Finding the Fourth Proportional to 21,978.96, 32,972.49 and 7,188.70

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Solution

The fourth proportional to 21,978.96, 32,972.49 and 7,188.70 is: 10,784.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.96 : 32,972.49 = 7,188.70 : x
  2. Step 2: Convert to fraction form
    21,978.96/32,972.49 = 7,188.70/x
  3. Step 3: Cross multiply
    21,978.96x = 32,972.49 × 7,188.70
  4. Step 4: Simplify right side
    21,978.96x = 237,029,256.43
  5. Step 5: Solve for x
    x = 237,029,256.43/21,978.96
  6. Step 6: Final answer
    x = 10,784.37

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