Finding the Fourth Proportional to 2,816.55, 3,876.78 and 2,339.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,816.55 : 3,876.78 = 2,339.20 : x
2. Step 2: Convert to fraction form
   2,816.55/3,876.78 = 2,339.20/x
3. Step 3: Cross multiply
   2,816.55x = 3,876.78 × 2,339.20
4. Step 4: Simplify right side
   2,816.55x = 9,068,563.78
5. Step 5: Solve for x
   x = 9,068,563.78/2,816.55
6. Step 6: Final answer
   x = 3,219.74