Finding the Fourth Proportional to 99,930.51, 137,903.82 and 54,608.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,930.51 : 137,903.82 = 54,608.78 : x
2. Step 2: Convert to fraction form
   99,930.51/137,903.82 = 54,608.78/x
3. Step 3: Cross multiply
   99,930.51x = 137,903.82 × 54,608.78
4. Step 4: Simplify right side
   99,930.51x = 7,530,759,367.54
5. Step 5: Solve for x
   x = 7,530,759,367.54/99,930.51
6. Step 6: Final answer
   x = 75,359.96