Finding the Fourth Proportional to 2,556.09, 3,528.05 and 1,561.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.09 : 3,528.05 = 1,561.95 : x
2. Step 2: Convert to fraction form
   2,556.09/3,528.05 = 1,561.95/x
3. Step 3: Cross multiply
   2,556.09x = 3,528.05 × 1,561.95
4. Step 4: Simplify right side
   2,556.09x = 5,510,629.89
5. Step 5: Solve for x
   x = 5,510,629.89/2,556.09
6. Step 6: Final answer
   x = 2,155.88