Finding the Fourth Proportional to 2,556.72, 3,528.47 and 1,422.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.72 : 3,528.47 = 1,422.65 : x
2. Step 2: Convert to fraction form
   2,556.72/3,528.47 = 1,422.65/x
3. Step 3: Cross multiply
   2,556.72x = 3,528.47 × 1,422.65
4. Step 4: Simplify right side
   2,556.72x = 5,019,753.09
5. Step 5: Solve for x
   x = 5,019,753.09/2,556.72
6. Step 6: Final answer
   x = 1,963.36