Finding the Fourth Proportional to 1,513.12, 2,265.84 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.12 : 2,265.84 = 862.72 : x
2. Step 2: Convert to fraction form
   1,513.12/2,265.84 = 862.72/x
3. Step 3: Cross multiply
   1,513.12x = 2,265.84 × 862.72
4. Step 4: Simplify right side
   1,513.12x = 1,954,785.48
5. Step 5: Solve for x
   x = 1,954,785.48/1,513.12
6. Step 6: Final answer
   x = 1,291.89