Finding the Fourth Proportional to 99,915.53, 137,879.31 and 54,595.06

Step by Step Solution

1. Step 1: Write the proportion equation
   99,915.53 : 137,879.31 = 54,595.06 : x
2. Step 2: Convert to fraction form
   99,915.53/137,879.31 = 54,595.06/x
3. Step 3: Cross multiply
   99,915.53x = 137,879.31 × 54,595.06
4. Step 4: Simplify right side
   99,915.53x = 7,527,529,837.81
5. Step 5: Solve for x
   x = 7,527,529,837.81/99,915.53
6. Step 6: Final answer
   x = 75,338.94