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Finding the Fourth Proportional to 1,309.80, 1,962.72 and 876.18

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Solution

The fourth proportional to 1,309.80, 1,962.72 and 876.18 is: 1,312.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.80 : 1,962.72 = 876.18 : x
  2. Step 2: Convert to fraction form
    1,309.80/1,962.72 = 876.18/x
  3. Step 3: Cross multiply
    1,309.80x = 1,962.72 × 876.18
  4. Step 4: Simplify right side
    1,309.80x = 1,719,696.01
  5. Step 5: Solve for x
    x = 1,719,696.01/1,309.80
  6. Step 6: Final answer
    x = 1,312.95

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