Finding the Fourth Proportional to 2,556.15, 3,525.31 and 2,159.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.15 : 3,525.31 = 2,159.76 : x
2. Step 2: Convert to fraction form
   2,556.15/3,525.31 = 2,159.76/x
3. Step 3: Cross multiply
   2,556.15x = 3,525.31 × 2,159.76
4. Step 4: Simplify right side
   2,556.15x = 7,613,823.53
5. Step 5: Solve for x
   x = 7,613,823.53/2,556.15
6. Step 6: Final answer
   x = 2,978.63