Finding the Fourth Proportional to 99,580.02, 137,418.68 and 54,258.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,580.02 : 137,418.68 = 54,258.38 : x
2. Step 2: Convert to fraction form
   99,580.02/137,418.68 = 54,258.38/x
3. Step 3: Cross multiply
   99,580.02x = 137,418.68 × 54,258.38
4. Step 4: Simplify right side
   99,580.02x = 7,456,114,000.15
5. Step 5: Solve for x
   x = 7,456,114,000.15/99,580.02
6. Step 6: Final answer
   x = 74,875.61