Finding the Fourth Proportional to 1,117.20, 1,675.18 and 656.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,117.20 : 1,675.18 = 656.10 : x
2. Step 2: Convert to fraction form
   1,117.20/1,675.18 = 656.10/x
3. Step 3: Cross multiply
   1,117.20x = 1,675.18 × 656.10
4. Step 4: Simplify right side
   1,117.20x = 1,099,085.60
5. Step 5: Solve for x
   x = 1,099,085.60/1,117.20
6. Step 6: Final answer
   x = 983.79