Finding the Fourth Proportional to 1,109.15, 1,530.64 and 611.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.15 : 1,530.64 = 611.83 : x
2. Step 2: Convert to fraction form
   1,109.15/1,530.64 = 611.83/x
3. Step 3: Cross multiply
   1,109.15x = 1,530.64 × 611.83
4. Step 4: Simplify right side
   1,109.15x = 936,491.47
5. Step 5: Solve for x
   x = 936,491.47/1,109.15
6. Step 6: Final answer
   x = 844.33