Finding the Fourth Proportional to 1,108.89, 1,530.28 and 611.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.89 : 1,530.28 = 611.52 : x
2. Step 2: Convert to fraction form
   1,108.89/1,530.28 = 611.52/x
3. Step 3: Cross multiply
   1,108.89x = 1,530.28 × 611.52
4. Step 4: Simplify right side
   1,108.89x = 935,803.90
5. Step 5: Solve for x
   x = 935,803.90/1,108.89
6. Step 6: Final answer
   x = 843.91