Finding the Fourth Proportional to 99,485.50, 137,290.05 and 54,773.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,485.50 : 137,290.05 = 54,773.50 : x
2. Step 2: Convert to fraction form
   99,485.50/137,290.05 = 54,773.50/x
3. Step 3: Cross multiply
   99,485.50x = 137,290.05 × 54,773.50
4. Step 4: Simplify right side
   99,485.50x = 7,519,856,553.68
5. Step 5: Solve for x
   x = 7,519,856,553.68/99,485.50
6. Step 6: Final answer
   x = 75,587.46