Finding the Fourth Proportional to 2,612.24, 3,918.72 and 881.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.24 : 3,918.72 = 881.12 : x
2. Step 2: Convert to fraction form
   2,612.24/3,918.72 = 881.12/x
3. Step 3: Cross multiply
   2,612.24x = 3,918.72 × 881.12
4. Step 4: Simplify right side
   2,612.24x = 3,452,862.57
5. Step 5: Solve for x
   x = 3,452,862.57/2,612.24
6. Step 6: Final answer
   x = 1,321.80