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Finding the Fourth Proportional to 47,831.52, 66,018.87 and 28,965

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Solution

The fourth proportional to 47,831.52, 66,018.87 and 28,965 is: 39,978.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,831.52 : 66,018.87 = 28,965 : x
  2. Step 2: Convert to fraction form
    47,831.52/66,018.87 = 28,965/x
  3. Step 3: Cross multiply
    47,831.52x = 66,018.87 × 28,965
  4. Step 4: Simplify right side
    47,831.52x = 1,912,236,569.55
  5. Step 5: Solve for x
    x = 1,912,236,569.55/47,831.52
  6. Step 6: Final answer
    x = 39,978.59

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