Finding the Fourth Proportional to 2,658.15, 3,981.56 and 2,168.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.15 : 3,981.56 = 2,168.91 : x
2. Step 2: Convert to fraction form
   2,658.15/3,981.56 = 2,168.91/x
3. Step 3: Cross multiply
   2,658.15x = 3,981.56 × 2,168.91
4. Step 4: Simplify right side
   2,658.15x = 8,635,634.46
5. Step 5: Solve for x
   x = 8,635,634.46/2,658.15
6. Step 6: Final answer
   x = 3,248.74