Finding the Fourth Proportional to 143,864.59, 215,828.05 and 55,118.10

Step by Step Solution

1. Step 1: Write the proportion equation
   143,864.59 : 215,828.05 = 55,118.10 : x
2. Step 2: Convert to fraction form
   143,864.59/215,828.05 = 55,118.10/x
3. Step 3: Cross multiply
   143,864.59x = 215,828.05 × 55,118.10
4. Step 4: Simplify right side
   143,864.59x = 11,896,032,042.71
5. Step 5: Solve for x
   x = 11,896,032,042.71/143,864.59
6. Step 6: Final answer
   x = 82,689.09