Finding the Fourth Proportional to 1,108.69, 1,529.96 and 611.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.69 : 1,529.96 = 611.31 : x
2. Step 2: Convert to fraction form
   1,108.69/1,529.96 = 611.31/x
3. Step 3: Cross multiply
   1,108.69x = 1,529.96 × 611.31
4. Step 4: Simplify right side
   1,108.69x = 935,279.85
5. Step 5: Solve for x
   x = 935,279.85/1,108.69
6. Step 6: Final answer
   x = 843.59