Finding the Fourth Proportional to 123,517.89, 170,388.87 and 75,134.61

Step by Step Solution

1. Step 1: Write the proportion equation
   123,517.89 : 170,388.87 = 75,134.61 : x
2. Step 2: Convert to fraction form
   123,517.89/170,388.87 = 75,134.61/x
3. Step 3: Cross multiply
   123,517.89x = 170,388.87 × 75,134.61
4. Step 4: Simplify right side
   123,517.89x = 12,802,101,493.25
5. Step 5: Solve for x
   x = 12,802,101,493.25/123,517.89
6. Step 6: Final answer
   x = 103,645.73