Finding the Fourth Proportional to 1,109.28, 1,662.88 and 560.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.28 : 1,662.88 = 560.80 : x
2. Step 2: Convert to fraction form
   1,109.28/1,662.88 = 560.80/x
3. Step 3: Cross multiply
   1,109.28x = 1,662.88 × 560.80
4. Step 4: Simplify right side
   1,109.28x = 932,543.10
5. Step 5: Solve for x
   x = 932,543.10/1,109.28
6. Step 6: Final answer
   x = 840.67