Finding the Fourth Proportional to 2,686.17, 4,029.72 and 931.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,686.17 : 4,029.72 = 931.35 : x
2. Step 2: Convert to fraction form
   2,686.17/4,029.72 = 931.35/x
3. Step 3: Cross multiply
   2,686.17x = 4,029.72 × 931.35
4. Step 4: Simplify right side
   2,686.17x = 3,753,079.72
5. Step 5: Solve for x
   x = 3,753,079.72/2,686.17
6. Step 6: Final answer
   x = 1,397.19