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Finding the Fourth Proportional to 78,912, 108,901.80 and 45,378

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Solution

The fourth proportional to 78,912, 108,901.80 and 45,378 is: 62,623.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,912 : 108,901.80 = 45,378 : x
  2. Step 2: Convert to fraction form
    78,912/108,901.80 = 45,378/x
  3. Step 3: Cross multiply
    78,912x = 108,901.80 × 45,378
  4. Step 4: Simplify right side
    78,912x = 4,941,745,880.40
  5. Step 5: Solve for x
    x = 4,941,745,880.40/78,912
  6. Step 6: Final answer
    x = 62,623.50

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