Finding the Fourth Proportional to 1,108.48, 1,529.71 and 611.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.48 : 1,529.71 = 611.10 : x
2. Step 2: Convert to fraction form
   1,108.48/1,529.71 = 611.10/x
3. Step 3: Cross multiply
   1,108.48x = 1,529.71 × 611.10
4. Step 4: Simplify right side
   1,108.48x = 934,805.78
5. Step 5: Solve for x
   x = 934,805.78/1,108.48
6. Step 6: Final answer
   x = 843.32