Finding the Fourth Proportional to 99,480.42, 137,281.60 and 54,158.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,480.42 : 137,281.60 = 54,158.78 : x
2. Step 2: Convert to fraction form
   99,480.42/137,281.60 = 54,158.78/x
3. Step 3: Cross multiply
   99,480.42x = 137,281.60 × 54,158.78
4. Step 4: Simplify right side
   99,480.42x = 7,435,003,972.45
5. Step 5: Solve for x
   x = 7,435,003,972.45/99,480.42
6. Step 6: Final answer
   x = 74,738.37