Finding the Fourth Proportional to 1,647.27, 2,271.60 and 1,056.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.27 : 2,271.60 = 1,056.78 : x
2. Step 2: Convert to fraction form
   1,647.27/2,271.60 = 1,056.78/x
3. Step 3: Cross multiply
   1,647.27x = 2,271.60 × 1,056.78
4. Step 4: Simplify right side
   1,647.27x = 2,400,581.45
5. Step 5: Solve for x
   x = 2,400,581.45/1,647.27
6. Step 6: Final answer
   x = 1,457.31