Finding the Fourth Proportional to 8,635.98, 12,956.72 and 3,089.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,635.98 : 12,956.72 = 3,089.21 : x
2. Step 2: Convert to fraction form
   8,635.98/12,956.72 = 3,089.21/x
3. Step 3: Cross multiply
   8,635.98x = 12,956.72 × 3,089.21
4. Step 4: Simplify right side
   8,635.98x = 40,025,948.76
5. Step 5: Solve for x
   x = 40,025,948.76/8,635.98
6. Step 6: Final answer
   x = 4,634.79