Finding the Fourth Proportional to 99,397.50, 137,168.55 and 54,688.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,397.50 : 137,168.55 = 54,688.38 : x
2. Step 2: Convert to fraction form
   99,397.50/137,168.55 = 54,688.38/x
3. Step 3: Cross multiply
   99,397.50x = 137,168.55 × 54,688.38
4. Step 4: Simplify right side
   99,397.50x = 7,501,525,786.45
5. Step 5: Solve for x
   x = 7,501,525,786.45/99,397.50
6. Step 6: Final answer
   x = 75,469.96