Finding the Fourth Proportional to 2,810.48, 4,212.56 and 1,053.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.48 : 4,212.56 = 1,053.78 : x
2. Step 2: Convert to fraction form
   2,810.48/4,212.56 = 1,053.78/x
3. Step 3: Cross multiply
   2,810.48x = 4,212.56 × 1,053.78
4. Step 4: Simplify right side
   2,810.48x = 4,439,111.48
5. Step 5: Solve for x
   x = 4,439,111.48/2,810.48
6. Step 6: Final answer
   x = 1,579.49