Finding the Fourth Proportional to 2,712.12, 4,064.92 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,712.12 : 4,064.92 = 978.72 : x
2. Step 2: Convert to fraction form
   2,712.12/4,064.92 = 978.72/x
3. Step 3: Cross multiply
   2,712.12x = 4,064.92 × 978.72
4. Step 4: Simplify right side
   2,712.12x = 3,978,418.50
5. Step 5: Solve for x
   x = 3,978,418.50/2,712.12
6. Step 6: Final answer
   x = 1,466.90