Finding the Fourth Proportional to 1,120.47, 1,681.39 and 659.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.47 : 1,681.39 = 659.15 : x
2. Step 2: Convert to fraction form
   1,120.47/1,681.39 = 659.15/x
3. Step 3: Cross multiply
   1,120.47x = 1,681.39 × 659.15
4. Step 4: Simplify right side
   1,120.47x = 1,108,288.22
5. Step 5: Solve for x
   x = 1,108,288.22/1,120.47
6. Step 6: Final answer
   x = 989.13