Finding the Fourth Proportional to 1,112.12, 1,535.22 and 664.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.12 : 1,535.22 = 664.15 : x
2. Step 2: Convert to fraction form
   1,112.12/1,535.22 = 664.15/x
3. Step 3: Cross multiply
   1,112.12x = 1,535.22 × 664.15
4. Step 4: Simplify right side
   1,112.12x = 1,019,615.40
5. Step 5: Solve for x
   x = 1,019,615.40/1,112.12
6. Step 6: Final answer
   x = 916.82