Finding the Fourth Proportional to 99,915.83, 137,879.74 and 54,595.37

Step by Step Solution

1. Step 1: Write the proportion equation
   99,915.83 : 137,879.74 = 54,595.37 : x
2. Step 2: Convert to fraction form
   99,915.83/137,879.74 = 54,595.37/x
3. Step 3: Cross multiply
   99,915.83x = 137,879.74 × 54,595.37
4. Step 4: Simplify right side
   99,915.83x = 7,527,595,420.80
5. Step 5: Solve for x
   x = 7,527,595,420.80/99,915.83
6. Step 6: Final answer
   x = 75,339.37