Finding the Fourth Proportional to 2,607.20, 3,910.42 and 659.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.20 : 3,910.42 = 659.28 : x
2. Step 2: Convert to fraction form
   2,607.20/3,910.42 = 659.28/x
3. Step 3: Cross multiply
   2,607.20x = 3,910.42 × 659.28
4. Step 4: Simplify right side
   2,607.20x = 2,578,061.70
5. Step 5: Solve for x
   x = 2,578,061.70/2,607.20
6. Step 6: Final answer
   x = 988.82