Finding the Fourth Proportional to 2,120.24, 3,180.17 and 659.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.24 : 3,180.17 = 659.25 : x
2. Step 2: Convert to fraction form
   2,120.24/3,180.17 = 659.25/x
3. Step 3: Cross multiply
   2,120.24x = 3,180.17 × 659.25
4. Step 4: Simplify right side
   2,120.24x = 2,096,528.72
5. Step 5: Solve for x
   x = 2,096,528.72/2,120.24
6. Step 6: Final answer
   x = 988.82