Finding the Fourth Proportional to 123,517.15, 170,455 and 72,530.48

Step by Step Solution

1. Step 1: Write the proportion equation
   123,517.15 : 170,455 = 72,530.48 : x
2. Step 2: Convert to fraction form
   123,517.15/170,455 = 72,530.48/x
3. Step 3: Cross multiply
   123,517.15x = 170,455 × 72,530.48
4. Step 4: Simplify right side
   123,517.15x = 12,363,182,968.40
5. Step 5: Solve for x
   x = 12,363,182,968.40/123,517.15
6. Step 6: Final answer
   x = 100,092.85