Finding the Fourth Proportional to 1,109.67, 1,531.33 and 612.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.67 : 1,531.33 = 612.31 : x
2. Step 2: Convert to fraction form
   1,109.67/1,531.33 = 612.31/x
3. Step 3: Cross multiply
   1,109.67x = 1,531.33 × 612.31
4. Step 4: Simplify right side
   1,109.67x = 937,648.67
5. Step 5: Solve for x
   x = 937,648.67/1,109.67
6. Step 6: Final answer
   x = 844.98