Finding the Fourth Proportional to 1,108.50, 1,661.52 and 561.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.50 : 1,661.52 = 561.18 : x
2. Step 2: Convert to fraction form
   1,108.50/1,661.52 = 561.18/x
3. Step 3: Cross multiply
   1,108.50x = 1,661.52 × 561.18
4. Step 4: Simplify right side
   1,108.50x = 932,411.79
5. Step 5: Solve for x
   x = 932,411.79/1,108.50
6. Step 6: Final answer
   x = 841.15