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Finding the Fourth Proportional to 78,138.54, 117,206.19 and 18,974.52

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Solution

The fourth proportional to 78,138.54, 117,206.19 and 18,974.52 is: 28,461.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,138.54 : 117,206.19 = 18,974.52 : x
  2. Step 2: Convert to fraction form
    78,138.54/117,206.19 = 18,974.52/x
  3. Step 3: Cross multiply
    78,138.54x = 117,206.19 × 18,974.52
  4. Step 4: Simplify right side
    78,138.54x = 2,223,931,196.28
  5. Step 5: Solve for x
    x = 2,223,931,196.28/78,138.54
  6. Step 6: Final answer
    x = 28,461.39

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