Finding the Fourth Proportional to 1,960.71, 2,707.04 and 1,215.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,960.71 : 2,707.04 = 1,215.46 : x
2. Step 2: Convert to fraction form
   1,960.71/2,707.04 = 1,215.46/x
3. Step 3: Cross multiply
   1,960.71x = 2,707.04 × 1,215.46
4. Step 4: Simplify right side
   1,960.71x = 3,290,285.30
5. Step 5: Solve for x
   x = 3,290,285.30/1,960.71
6. Step 6: Final answer
   x = 1,678.11