Finding the Fourth Proportional to 8,522.17, 12,785.28 and 2,678.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,522.17 : 12,785.28 = 2,678.79 : x
2. Step 2: Convert to fraction form
   8,522.17/12,785.28 = 2,678.79/x
3. Step 3: Cross multiply
   8,522.17x = 12,785.28 × 2,678.79
4. Step 4: Simplify right side
   8,522.17x = 34,249,022.22
5. Step 5: Solve for x
   x = 34,249,022.22/8,522.17
6. Step 6: Final answer
   x = 4,018.81