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Finding the Fourth Proportional to 78,031.18, 107,682.23 and 42,220.40

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Solution

The fourth proportional to 78,031.18, 107,682.23 and 42,220.40 is: 58,263.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,031.18 : 107,682.23 = 42,220.40 : x
  2. Step 2: Convert to fraction form
    78,031.18/107,682.23 = 42,220.40/x
  3. Step 3: Cross multiply
    78,031.18x = 107,682.23 × 42,220.40
  4. Step 4: Simplify right side
    78,031.18x = 4,546,386,612.39
  5. Step 5: Solve for x
    x = 4,546,386,612.39/78,031.18
  6. Step 6: Final answer
    x = 58,263.72

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