Finding the Fourth Proportional to 1,109.58, 1,531.18 and 612.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.58 : 1,531.18 = 612.16 : x
2. Step 2: Convert to fraction form
   1,109.58/1,531.18 = 612.16/x
3. Step 3: Cross multiply
   1,109.58x = 1,531.18 × 612.16
4. Step 4: Simplify right side
   1,109.58x = 937,327.15
5. Step 5: Solve for x
   x = 937,327.15/1,109.58
6. Step 6: Final answer
   x = 844.76