Finding the Fourth Proportional to 1,108.86, 1,530.17 and 611.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.86 : 1,530.17 = 611.53 : x
2. Step 2: Convert to fraction form
   1,108.86/1,530.17 = 611.53/x
3. Step 3: Cross multiply
   1,108.86x = 1,530.17 × 611.53
4. Step 4: Simplify right side
   1,108.86x = 935,744.86
5. Step 5: Solve for x
   x = 935,744.86/1,108.86
6. Step 6: Final answer
   x = 843.88