Finding the Fourth Proportional to 123,729.80, 170,737.72 and 72,744.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,729.80 : 170,737.72 = 72,744.60 : x
2. Step 2: Convert to fraction form
   123,729.80/170,737.72 = 72,744.60/x
3. Step 3: Cross multiply
   123,729.80x = 170,737.72 × 72,744.60
4. Step 4: Simplify right side
   123,729.80x = 12,420,247,146.31
5. Step 5: Solve for x
   x = 12,420,247,146.31/123,729.80
6. Step 6: Final answer
   x = 100,382.02