Finding the Fourth Proportional to 99,931.12, 137,903.28 and 54,608.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,931.12 : 137,903.28 = 54,608.10 : x
2. Step 2: Convert to fraction form
   99,931.12/137,903.28 = 54,608.10/x
3. Step 3: Cross multiply
   99,931.12x = 137,903.28 × 54,608.10
4. Step 4: Simplify right side
   99,931.12x = 7,530,636,104.57
5. Step 5: Solve for x
   x = 7,530,636,104.57/99,931.12
6. Step 6: Final answer
   x = 75,358.27