Finding the Fourth Proportional to 143,591.31, 215,387.03 and 64,613.28

Step by Step Solution

1. Step 1: Write the proportion equation
   143,591.31 : 215,387.03 = 64,613.28 : x
2. Step 2: Convert to fraction form
   143,591.31/215,387.03 = 64,613.28/x
3. Step 3: Cross multiply
   143,591.31x = 215,387.03 × 64,613.28
4. Step 4: Simplify right side
   143,591.31x = 13,916,862,154.69
5. Step 5: Solve for x
   x = 13,916,862,154.69/143,591.31
6. Step 6: Final answer
   x = 96,919.95