Finding the Fourth Proportional to 1,109.33, 1,530.71 and 611.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.33 : 1,530.71 = 611.99 : x
2. Step 2: Convert to fraction form
   1,109.33/1,530.71 = 611.99/x
3. Step 3: Cross multiply
   1,109.33x = 1,530.71 × 611.99
4. Step 4: Simplify right side
   1,109.33x = 936,779.21
5. Step 5: Solve for x
   x = 936,779.21/1,109.33
6. Step 6: Final answer
   x = 844.45