Finding the Fourth Proportional to 2,769.22, 4,128.17 and 2,561.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,769.22 : 4,128.17 = 2,561.86 : x
2. Step 2: Convert to fraction form
   2,769.22/4,128.17 = 2,561.86/x
3. Step 3: Cross multiply
   2,769.22x = 4,128.17 × 2,561.86
4. Step 4: Simplify right side
   2,769.22x = 10,575,793.60
5. Step 5: Solve for x
   x = 10,575,793.60/2,769.22
6. Step 6: Final answer
   x = 3,819.05