Finding the Fourth Proportional to 2,952.72, 4,428.60 and 978.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,952.72 : 4,428.60 = 978.36 : x
2. Step 2: Convert to fraction form
   2,952.72/4,428.60 = 978.36/x
3. Step 3: Cross multiply
   2,952.72x = 4,428.60 × 978.36
4. Step 4: Simplify right side
   2,952.72x = 4,332,765.10
5. Step 5: Solve for x
   x = 4,332,765.10/2,952.72
6. Step 6: Final answer
   x = 1,467.38