Finding the Fourth Proportional to 978.96, 1,352.36 and 760.72

Step by Step Solution

1. Step 1: Write the proportion equation
   978.96 : 1,352.36 = 760.72 : x
2. Step 2: Convert to fraction form
   978.96/1,352.36 = 760.72/x
3. Step 3: Cross multiply
   978.96x = 1,352.36 × 760.72
4. Step 4: Simplify right side
   978.96x = 1,028,767.30
5. Step 5: Solve for x
   x = 1,028,767.30/978.96
6. Step 6: Final answer
   x = 1,050.88