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Finding the Fourth Proportional to 57,128.72, 78,838.68 and 31,978.16

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Solution

The fourth proportional to 57,128.72, 78,838.68 and 31,978.16 is: 44,130.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,128.72 : 78,838.68 = 31,978.16 : x
  2. Step 2: Convert to fraction form
    57,128.72/78,838.68 = 31,978.16/x
  3. Step 3: Cross multiply
    57,128.72x = 78,838.68 × 31,978.16
  4. Step 4: Simplify right side
    57,128.72x = 2,521,115,923.23
  5. Step 5: Solve for x
    x = 2,521,115,923.23/57,128.72
  6. Step 6: Final answer
    x = 44,130.45

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