Finding the Fourth Proportional to 1,109.43, 1,531.03 and 612.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.43 : 1,531.03 = 612.09 : x
2. Step 2: Convert to fraction form
   1,109.43/1,531.03 = 612.09/x
3. Step 3: Cross multiply
   1,109.43x = 1,531.03 × 612.09
4. Step 4: Simplify right side
   1,109.43x = 937,128.15
5. Step 5: Solve for x
   x = 937,128.15/1,109.43
6. Step 6: Final answer
   x = 844.69