Finding the Fourth Proportional to 1,109.61, 1,531.25 and 612.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.61 : 1,531.25 = 612.25 : x
2. Step 2: Convert to fraction form
   1,109.61/1,531.25 = 612.25/x
3. Step 3: Cross multiply
   1,109.61x = 1,531.25 × 612.25
4. Step 4: Simplify right side
   1,109.61x = 937,506.28
5. Step 5: Solve for x
   x = 937,506.28/1,109.61
6. Step 6: Final answer
   x = 844.90