Finding the Fourth Proportional to 8,491.91, 12,738.50 and 2,251.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,491.91 : 12,738.50 = 2,251.89 : x
2. Step 2: Convert to fraction form
   8,491.91/12,738.50 = 2,251.89/x
3. Step 3: Cross multiply
   8,491.91x = 12,738.50 × 2,251.89
4. Step 4: Simplify right side
   8,491.91x = 28,685,689.51
5. Step 5: Solve for x
   x = 28,685,689.51/8,491.91
6. Step 6: Final answer
   x = 3,378.00