Finding the Fourth Proportional to 8,355.25, 12,528.78 and 3,423.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,355.25 : 12,528.78 = 3,423.55 : x
2. Step 2: Convert to fraction form
   8,355.25/12,528.78 = 3,423.55/x
3. Step 3: Cross multiply
   8,355.25x = 12,528.78 × 3,423.55
4. Step 4: Simplify right side
   8,355.25x = 42,892,904.77
5. Step 5: Solve for x
   x = 42,892,904.77/8,355.25
6. Step 6: Final answer
   x = 5,133.65