Finding the Fourth Proportional to 99,688.10, 137,569.18 and 54,365.98

Step by Step Solution

1. Step 1: Write the proportion equation
   99,688.10 : 137,569.18 = 54,365.98 : x
2. Step 2: Convert to fraction form
   99,688.10/137,569.18 = 54,365.98/x
3. Step 3: Cross multiply
   99,688.10x = 137,569.18 × 54,365.98
4. Step 4: Simplify right side
   99,688.10x = 7,479,083,288.50
5. Step 5: Solve for x
   x = 7,479,083,288.50/99,688.10
6. Step 6: Final answer
   x = 75,024.84