Finding the Fourth Proportional to 89,357, 123,543.06 and 85,440.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,357 : 123,543.06 = 85,440.20 : x
2. Step 2: Convert to fraction form
   89,357/123,543.06 = 85,440.20/x
3. Step 3: Cross multiply
   89,357x = 123,543.06 × 85,440.20
4. Step 4: Simplify right side
   89,357x = 10,555,543,755.01
5. Step 5: Solve for x
   x = 10,555,543,755.01/89,357
6. Step 6: Final answer
   x = 118,127.78