Finding the Fourth Proportional to 123,519.89, 170,391.62 and 75,136.61

Step by Step Solution

1. Step 1: Write the proportion equation
   123,519.89 : 170,391.62 = 75,136.61 : x
2. Step 2: Convert to fraction form
   123,519.89/170,391.62 = 75,136.61/x
3. Step 3: Cross multiply
   123,519.89x = 170,391.62 × 75,136.61
4. Step 4: Simplify right side
   123,519.89x = 12,802,648,699.21
5. Step 5: Solve for x
   x = 12,802,648,699.21/123,519.89
6. Step 6: Final answer
   x = 103,648.48