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Finding the Fourth Proportional to 20,978.32, 31,486.92 and 10,597.36

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Solution

The fourth proportional to 20,978.32, 31,486.92 and 10,597.36 is: 15,905.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.32 : 31,486.92 = 10,597.36 : x
  2. Step 2: Convert to fraction form
    20,978.32/31,486.92 = 10,597.36/x
  3. Step 3: Cross multiply
    20,978.32x = 31,486.92 × 10,597.36
  4. Step 4: Simplify right side
    20,978.32x = 333,678,226.53
  5. Step 5: Solve for x
    x = 333,678,226.53/20,978.32
  6. Step 6: Final answer
    x = 15,905.86

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