Finding the Fourth Proportional to 2,686.16, 4,029.56 and 931.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,686.16 : 4,029.56 = 931.32 : x
2. Step 2: Convert to fraction form
   2,686.16/4,029.56 = 931.32/x
3. Step 3: Cross multiply
   2,686.16x = 4,029.56 × 931.32
4. Step 4: Simplify right side
   2,686.16x = 3,752,809.82
5. Step 5: Solve for x
   x = 3,752,809.82/2,686.16
6. Step 6: Final answer
   x = 1,397.09