Finding the Fourth Proportional to 99,683.80, 137,562.78 and 54,362.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,683.80 : 137,562.78 = 54,362.50 : x
2. Step 2: Convert to fraction form
   99,683.80/137,562.78 = 54,362.50/x
3. Step 3: Cross multiply
   99,683.80x = 137,562.78 × 54,362.50
4. Step 4: Simplify right side
   99,683.80x = 7,478,256,627.75
5. Step 5: Solve for x
   x = 7,478,256,627.75/99,683.80
6. Step 6: Final answer
   x = 75,019.78