Finding the Fourth Proportional to 8,478.64, 12,716.50 and 2,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.64 : 12,716.50 = 2,238.72 : x
2. Step 2: Convert to fraction form
   8,478.64/12,716.50 = 2,238.72/x
3. Step 3: Cross multiply
   8,478.64x = 12,716.50 × 2,238.72
4. Step 4: Simplify right side
   8,478.64x = 28,468,682.88
5. Step 5: Solve for x
   x = 28,468,682.88/8,478.64
6. Step 6: Final answer
   x = 3,357.69