Finding the Fourth Proportional to 1,109.28, 1,530.69 and 611.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.28 : 1,530.69 = 611.89 : x
2. Step 2: Convert to fraction form
   1,109.28/1,530.69 = 611.89/x
3. Step 3: Cross multiply
   1,109.28x = 1,530.69 × 611.89
4. Step 4: Simplify right side
   1,109.28x = 936,613.90
5. Step 5: Solve for x
   x = 936,613.90/1,109.28
6. Step 6: Final answer
   x = 844.34