Finding the Fourth Proportional to 99,553.59, 137,382.89 and 57,118.77

Step by Step Solution

1. Step 1: Write the proportion equation
   99,553.59 : 137,382.89 = 57,118.77 : x
2. Step 2: Convert to fraction form
   99,553.59/137,382.89 = 57,118.77/x
3. Step 3: Cross multiply
   99,553.59x = 137,382.89 × 57,118.77
4. Step 4: Simplify right side
   99,553.59x = 7,847,141,410.25
5. Step 5: Solve for x
   x = 7,847,141,410.25/99,553.59
6. Step 6: Final answer
   x = 78,823.29