Finding the Fourth Proportional to 99,912.49, 137,877.61 and 54,589.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,912.49 : 137,877.61 = 54,589.50 : x
2. Step 2: Convert to fraction form
   99,912.49/137,877.61 = 54,589.50/x
3. Step 3: Cross multiply
   99,912.49x = 137,877.61 × 54,589.50
4. Step 4: Simplify right side
   99,912.49x = 7,526,669,791.10
5. Step 5: Solve for x
   x = 7,526,669,791.10/99,912.49
6. Step 6: Final answer
   x = 75,332.62