Finding the Fourth Proportional to 99,865.81, 137,815.86 and 54,545.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,865.81 : 137,815.86 = 54,545.10 : x
2. Step 2: Convert to fraction form
   99,865.81/137,815.86 = 54,545.10/x
3. Step 3: Cross multiply
   99,865.81x = 137,815.86 × 54,545.10
4. Step 4: Simplify right side
   99,865.81x = 7,517,179,865.29
5. Step 5: Solve for x
   x = 7,517,179,865.29/99,865.81
6. Step 6: Final answer
   x = 75,272.81