Finding the Fourth Proportional to 1,647.81, 2,271.38 and 1,057.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.81 : 2,271.38 = 1,057.32 : x
2. Step 2: Convert to fraction form
   1,647.81/2,271.38 = 1,057.32/x
3. Step 3: Cross multiply
   1,647.81x = 2,271.38 × 1,057.32
4. Step 4: Simplify right side
   1,647.81x = 2,401,570.22
5. Step 5: Solve for x
   x = 2,401,570.22/1,647.81
6. Step 6: Final answer
   x = 1,457.43