Finding the Fourth Proportional to 8,522.12, 12,788.67 and 3,591.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,522.12 : 12,788.67 = 3,591.78 : x
2. Step 2: Convert to fraction form
   8,522.12/12,788.67 = 3,591.78/x
3. Step 3: Cross multiply
   8,522.12x = 12,788.67 × 3,591.78
4. Step 4: Simplify right side
   8,522.12x = 45,934,089.13
5. Step 5: Solve for x
   x = 45,934,089.13/8,522.12
6. Step 6: Final answer
   x = 5,389.99