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Finding the Fourth Proportional to 3,945.36, 5,918.36 and 1,312.77

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Solution

The fourth proportional to 3,945.36, 5,918.36 and 1,312.77 is: 1,969.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,945.36 : 5,918.36 = 1,312.77 : x
  2. Step 2: Convert to fraction form
    3,945.36/5,918.36 = 1,312.77/x
  3. Step 3: Cross multiply
    3,945.36x = 5,918.36 × 1,312.77
  4. Step 4: Simplify right side
    3,945.36x = 7,769,438.89
  5. Step 5: Solve for x
    x = 7,769,438.89/3,945.36
  6. Step 6: Final answer
    x = 1,969.26

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