Finding the Fourth Proportional to 8,390.29, 12,585.33 and 3,392.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,390.29 : 12,585.33 = 3,392.59 : x
2. Step 2: Convert to fraction form
   8,390.29/12,585.33 = 3,392.59/x
3. Step 3: Cross multiply
   8,390.29x = 12,585.33 × 3,392.59
4. Step 4: Simplify right side
   8,390.29x = 42,696,864.70
5. Step 5: Solve for x
   x = 42,696,864.70/8,390.29
6. Step 6: Final answer
   x = 5,088.84