Finding the Fourth Proportional to 2,906.88, 4,011.52 and 2,686.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,906.88 : 4,011.52 = 2,686.40 : x
2. Step 2: Convert to fraction form
   2,906.88/4,011.52 = 2,686.40/x
3. Step 3: Cross multiply
   2,906.88x = 4,011.52 × 2,686.40
4. Step 4: Simplify right side
   2,906.88x = 10,776,547.33
5. Step 5: Solve for x
   x = 10,776,547.33/2,906.88
6. Step 6: Final answer
   x = 3,707.26