Finding the Fourth Proportional to 123,490.88, 170,407.28 and 72,498.08

Step by Step Solution

1. Step 1: Write the proportion equation
   123,490.88 : 170,407.28 = 72,498.08 : x
2. Step 2: Convert to fraction form
   123,490.88/170,407.28 = 72,498.08/x
3. Step 3: Cross multiply
   123,490.88x = 170,407.28 × 72,498.08
4. Step 4: Simplify right side
   123,490.88x = 12,354,200,618.02
5. Step 5: Solve for x
   x = 12,354,200,618.02/123,490.88
6. Step 6: Final answer
   x = 100,041.40