Finding the Fourth Proportional to 89,680, 123,716.82 and 57,859.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89,680 : 123,716.82 = 57,859.12 : x
2. Step 2: Convert to fraction form
   89,680/123,716.82 = 57,859.12/x
3. Step 3: Cross multiply
   89,680x = 123,716.82 × 57,859.12
4. Step 4: Simplify right side
   89,680x = 7,158,146,334.40
5. Step 5: Solve for x
   x = 7,158,146,334.40/89,680
6. Step 6: Final answer
   x = 79,818.76