Finding the Fourth Proportional to 1,109.31, 1,530.85 and 611.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.31 : 1,530.85 = 611.94 : x
2. Step 2: Convert to fraction form
   1,109.31/1,530.85 = 611.94/x
3. Step 3: Cross multiply
   1,109.31x = 1,530.85 × 611.94
4. Step 4: Simplify right side
   1,109.31x = 936,788.35
5. Step 5: Solve for x
   x = 936,788.35/1,109.31
6. Step 6: Final answer
   x = 844.48