Finding the Fourth Proportional to 8,641.98, 12,964.89 and 2,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,641.98 : 12,964.89 = 2,485.50 : x
2. Step 2: Convert to fraction form
   8,641.98/12,964.89 = 2,485.50/x
3. Step 3: Cross multiply
   8,641.98x = 12,964.89 × 2,485.50
4. Step 4: Simplify right side
   8,641.98x = 32,224,234.10
5. Step 5: Solve for x
   x = 32,224,234.10/8,641.98
6. Step 6: Final answer
   x = 3,728.80