Finding the Fourth Proportional to 123,692.88, 170,856.36 and 91,493

Step by Step Solution

1. Step 1: Write the proportion equation
   123,692.88 : 170,856.36 = 91,493 : x
2. Step 2: Convert to fraction form
   123,692.88/170,856.36 = 91,493/x
3. Step 3: Cross multiply
   123,692.88x = 170,856.36 × 91,493
4. Step 4: Simplify right side
   123,692.88x = 15,632,160,945.48
5. Step 5: Solve for x
   x = 15,632,160,945.48/123,692.88
6. Step 6: Final answer
   x = 126,378.83