Finding the Fourth Proportional to 99,351.34, 137,104.77 and 54,639.34

Step by Step Solution

1. Step 1: Write the proportion equation
   99,351.34 : 137,104.77 = 54,639.34 : x
2. Step 2: Convert to fraction form
   99,351.34/137,104.77 = 54,639.34/x
3. Step 3: Cross multiply
   99,351.34x = 137,104.77 × 54,639.34
4. Step 4: Simplify right side
   99,351.34x = 7,491,314,143.65
5. Step 5: Solve for x
   x = 7,491,314,143.65/99,351.34
6. Step 6: Final answer
   x = 75,402.25