Finding the Fourth Proportional to 2,815.83, 4,220.01 and 1,256.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.83 : 4,220.01 = 1,256.22 : x
2. Step 2: Convert to fraction form
   2,815.83/4,220.01 = 1,256.22/x
3. Step 3: Cross multiply
   2,815.83x = 4,220.01 × 1,256.22
4. Step 4: Simplify right side
   2,815.83x = 5,301,260.96
5. Step 5: Solve for x
   x = 5,301,260.96/2,815.83
6. Step 6: Final answer
   x = 1,882.66