Finding the Fourth Proportional to 99,758.61, 137,662.61 and 54,435.47

Step by Step Solution

1. Step 1: Write the proportion equation
   99,758.61 : 137,662.61 = 54,435.47 : x
2. Step 2: Convert to fraction form
   99,758.61/137,662.61 = 54,435.47/x
3. Step 3: Cross multiply
   99,758.61x = 137,662.61 × 54,435.47
4. Step 4: Simplify right side
   99,758.61x = 7,493,727,916.29
5. Step 5: Solve for x
   x = 7,493,727,916.29/99,758.61
6. Step 6: Final answer
   x = 75,118.61