Finding the Fourth Proportional to 8,505.54, 12,760.61 and 2,959.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,505.54 : 12,760.61 = 2,959.20 : x
2. Step 2: Convert to fraction form
   8,505.54/12,760.61 = 2,959.20/x
3. Step 3: Cross multiply
   8,505.54x = 12,760.61 × 2,959.20
4. Step 4: Simplify right side
   8,505.54x = 37,761,182.32
5. Step 5: Solve for x
   x = 37,761,182.32/8,505.54
6. Step 6: Final answer
   x = 4,439.60