Finding the Fourth Proportional to 123,687.88, 170,849.46 and 91,488

Step by Step Solution

1. Step 1: Write the proportion equation
   123,687.88 : 170,849.46 = 91,488 : x
2. Step 2: Convert to fraction form
   123,687.88/170,849.46 = 91,488/x
3. Step 3: Cross multiply
   123,687.88x = 170,849.46 × 91,488
4. Step 4: Simplify right side
   123,687.88x = 15,630,675,396.48
5. Step 5: Solve for x
   x = 15,630,675,396.48/123,687.88
6. Step 6: Final answer
   x = 126,371.92