Finding the Fourth Proportional to 8,321.85, 12,479.90 and 2,773.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.85 : 12,479.90 = 2,773.89 : x
2. Step 2: Convert to fraction form
   8,321.85/12,479.90 = 2,773.89/x
3. Step 3: Cross multiply
   8,321.85x = 12,479.90 × 2,773.89
4. Step 4: Simplify right side
   8,321.85x = 34,617,855.94
5. Step 5: Solve for x
   x = 34,617,855.94/8,321.85
6. Step 6: Final answer
   x = 4,159.88