Finding the Fourth Proportional to 2,557.12, 3,528.64 and 1,422.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.12 : 3,528.64 = 1,422.86 : x
2. Step 2: Convert to fraction form
   2,557.12/3,528.64 = 1,422.86/x
3. Step 3: Cross multiply
   2,557.12x = 3,528.64 × 1,422.86
4. Step 4: Simplify right side
   2,557.12x = 5,020,760.71
5. Step 5: Solve for x
   x = 5,020,760.71/2,557.12
6. Step 6: Final answer
   x = 1,963.44