Finding the Fourth Proportional to 99,517.79, 137,328.32 and 54,805.79

Step by Step Solution

1. Step 1: Write the proportion equation
   99,517.79 : 137,328.32 = 54,805.79 : x
2. Step 2: Convert to fraction form
   99,517.79/137,328.32 = 54,805.79/x
3. Step 3: Cross multiply
   99,517.79x = 137,328.32 × 54,805.79
4. Step 4: Simplify right side
   99,517.79x = 7,526,386,380.33
5. Step 5: Solve for x
   x = 7,526,386,380.33/99,517.79
6. Step 6: Final answer
   x = 75,628.56