Finding the Fourth Proportional to 2,820.34, 4,218.09 and 2,561.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.34 : 4,218.09 = 2,561.98 : x
2. Step 2: Convert to fraction form
   2,820.34/4,218.09 = 2,561.98/x
3. Step 3: Cross multiply
   2,820.34x = 4,218.09 × 2,561.98
4. Step 4: Simplify right side
   2,820.34x = 10,806,662.22
5. Step 5: Solve for x
   x = 10,806,662.22/2,820.34
6. Step 6: Final answer
   x = 3,831.69