Finding the Fourth Proportional to 1,109.46, 1,531.05 and 612.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.46 : 1,531.05 = 612.12 : x
2. Step 2: Convert to fraction form
   1,109.46/1,531.05 = 612.12/x
3. Step 3: Cross multiply
   1,109.46x = 1,531.05 × 612.12
4. Step 4: Simplify right side
   1,109.46x = 937,184.03
5. Step 5: Solve for x
   x = 937,184.03/1,109.46
6. Step 6: Final answer
   x = 844.72