Finding the Fourth Proportional to 2,818.17, 3,889.80 and 2,686.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.17 : 3,889.80 = 2,686.14 : x
2. Step 2: Convert to fraction form
   2,818.17/3,889.80 = 2,686.14/x
3. Step 3: Cross multiply
   2,818.17x = 3,889.80 × 2,686.14
4. Step 4: Simplify right side
   2,818.17x = 10,448,547.37
5. Step 5: Solve for x
   x = 10,448,547.37/2,818.17
6. Step 6: Final answer
   x = 3,707.56