Finding the Fourth Proportional to 8,422.74, 12,634.71 and 2,578.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,422.74 : 12,634.71 = 2,578.59 : x
2. Step 2: Convert to fraction form
   8,422.74/12,634.71 = 2,578.59/x
3. Step 3: Cross multiply
   8,422.74x = 12,634.71 × 2,578.59
4. Step 4: Simplify right side
   8,422.74x = 32,579,673.69
5. Step 5: Solve for x
   x = 32,579,673.69/8,422.74
6. Step 6: Final answer
   x = 3,868.06