Finding the Fourth Proportional to 1,978.57, 2,730.79 and 1,271.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.57 : 2,730.79 = 1,271.29 : x
2. Step 2: Convert to fraction form
   1,978.57/2,730.79 = 1,271.29/x
3. Step 3: Cross multiply
   1,978.57x = 2,730.79 × 1,271.29
4. Step 4: Simplify right side
   1,978.57x = 3,471,629.34
5. Step 5: Solve for x
   x = 3,471,629.34/1,978.57
6. Step 6: Final answer
   x = 1,754.62