Finding the Fourth Proportional to 99,573.43, 137,440.31 and 65,123.05

Step by Step Solution

1. Step 1: Write the proportion equation
   99,573.43 : 137,440.31 = 65,123.05 : x
2. Step 2: Convert to fraction form
   99,573.43/137,440.31 = 65,123.05/x
3. Step 3: Cross multiply
   99,573.43x = 137,440.31 × 65,123.05
4. Step 4: Simplify right side
   99,573.43x = 8,950,532,053.48
5. Step 5: Solve for x
   x = 8,950,532,053.48/99,573.43
6. Step 6: Final answer
   x = 89,888.76