Finding the Fourth Proportional to 123,689.88, 170,852.22 and 91,490

Step by Step Solution

1. Step 1: Write the proportion equation
   123,689.88 : 170,852.22 = 91,490 : x
2. Step 2: Convert to fraction form
   123,689.88/170,852.22 = 91,490/x
3. Step 3: Cross multiply
   123,689.88x = 170,852.22 × 91,490
4. Step 4: Simplify right side
   123,689.88x = 15,631,269,607.80
5. Step 5: Solve for x
   x = 15,631,269,607.80/123,689.88
6. Step 6: Final answer
   x = 126,374.68