Finding the Fourth Proportional to 8,388.71, 12,584.27 and 3,123.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,388.71 : 12,584.27 = 3,123.28 : x
2. Step 2: Convert to fraction form
   8,388.71/12,584.27 = 3,123.28/x
3. Step 3: Cross multiply
   8,388.71x = 12,584.27 × 3,123.28
4. Step 4: Simplify right side
   8,388.71x = 39,304,175.15
5. Step 5: Solve for x
   x = 39,304,175.15/8,388.71
6. Step 6: Final answer
   x = 4,685.37