Finding the Fourth Proportional to 99,930.31, 137,904.20 and 54,608.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99,930.31 : 137,904.20 = 54,608.31 : x
2. Step 2: Convert to fraction form
   99,930.31/137,904.20 = 54,608.31/x
3. Step 3: Cross multiply
   99,930.31x = 137,904.20 × 54,608.31
4. Step 4: Simplify right side
   99,930.31x = 7,530,715,303.90
5. Step 5: Solve for x
   x = 7,530,715,303.90/99,930.31
6. Step 6: Final answer
   x = 75,359.67