Finding the Fourth Proportional to 143,731.71, 215,710.56 and 99,668.52

Step by Step Solution

1. Step 1: Write the proportion equation
   143,731.71 : 215,710.56 = 99,668.52 : x
2. Step 2: Convert to fraction form
   143,731.71/215,710.56 = 99,668.52/x
3. Step 3: Cross multiply
   143,731.71x = 215,710.56 × 99,668.52
4. Step 4: Simplify right side
   143,731.71x = 21,499,552,263.57
5. Step 5: Solve for x
   x = 21,499,552,263.57/143,731.71
6. Step 6: Final answer
   x = 149,581.13