Finding the Fourth Proportional to 1,109.13, 1,530.69 and 611.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.13 : 1,530.69 = 611.86 : x
2. Step 2: Convert to fraction form
   1,109.13/1,530.69 = 611.86/x
3. Step 3: Cross multiply
   1,109.13x = 1,530.69 × 611.86
4. Step 4: Simplify right side
   1,109.13x = 936,567.98
5. Step 5: Solve for x
   x = 936,567.98/1,109.13
6. Step 6: Final answer
   x = 844.42