Finding the Fourth Proportional to 1,022.40, 1,531.98 and 656.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.40 : 1,531.98 = 656.89 : x
2. Step 2: Convert to fraction form
   1,022.40/1,531.98 = 656.89/x
3. Step 3: Cross multiply
   1,022.40x = 1,531.98 × 656.89
4. Step 4: Simplify right side
   1,022.40x = 1,006,338.51
5. Step 5: Solve for x
   x = 1,006,338.51/1,022.40
6. Step 6: Final answer
   x = 984.29