Finding the Fourth Proportional to 99,855.72, 137,802 and 54,535.05

Step by Step Solution

1. Step 1: Write the proportion equation
   99,855.72 : 137,802 = 54,535.05 : x
2. Step 2: Convert to fraction form
   99,855.72/137,802 = 54,535.05/x
3. Step 3: Cross multiply
   99,855.72x = 137,802 × 54,535.05
4. Step 4: Simplify right side
   99,855.72x = 7,515,038,960.10
5. Step 5: Solve for x
   x = 7,515,038,960.10/99,855.72
6. Step 6: Final answer
   x = 75,258.97