Finding the Fourth Proportional to 1,109.69, 1,531.29 and 612.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.69 : 1,531.29 = 612.24 : x
2. Step 2: Convert to fraction form
   1,109.69/1,531.29 = 612.24/x
3. Step 3: Cross multiply
   1,109.69x = 1,531.29 × 612.24
4. Step 4: Simplify right side
   1,109.69x = 937,519.29
5. Step 5: Solve for x
   x = 937,519.29/1,109.69
6. Step 6: Final answer
   x = 844.85