Finding the Fourth Proportional to 1,109.52, 1,531.13 and 612.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.52 : 1,531.13 = 612.18 : x
2. Step 2: Convert to fraction form
   1,109.52/1,531.13 = 612.18/x
3. Step 3: Cross multiply
   1,109.52x = 1,531.13 × 612.18
4. Step 4: Simplify right side
   1,109.52x = 937,332.52
5. Step 5: Solve for x
   x = 937,332.52/1,109.52
6. Step 6: Final answer
   x = 844.81