Finding the Fourth Proportional to 89,355, 123,540.30 and 85,438.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,355 : 123,540.30 = 85,438.20 : x
2. Step 2: Convert to fraction form
   89,355/123,540.30 = 85,438.20/x
3. Step 3: Cross multiply
   89,355x = 123,540.30 × 85,438.20
4. Step 4: Simplify right side
   89,355x = 10,555,060,859.46
5. Step 5: Solve for x
   x = 10,555,060,859.46/89,355
6. Step 6: Final answer
   x = 118,125.02