Finding the Fourth Proportional to 99,578.61, 137,417.22 and 54,258.48

Step by Step Solution

1. Step 1: Write the proportion equation
   99,578.61 : 137,417.22 = 54,258.48 : x
2. Step 2: Convert to fraction form
   99,578.61/137,417.22 = 54,258.48/x
3. Step 3: Cross multiply
   99,578.61x = 137,417.22 × 54,258.48
4. Step 4: Simplify right side
   99,578.61x = 7,456,049,483.03
5. Step 5: Solve for x
   x = 7,456,049,483.03/99,578.61
6. Step 6: Final answer
   x = 74,876.01