Finding the Fourth Proportional to 2,620.44, 3,932.46 and 978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.44 : 3,932.46 = 978.30 : x
2. Step 2: Convert to fraction form
   2,620.44/3,932.46 = 978.30/x
3. Step 3: Cross multiply
   2,620.44x = 3,932.46 × 978.30
4. Step 4: Simplify right side
   2,620.44x = 3,847,125.62
5. Step 5: Solve for x
   x = 3,847,125.62/2,620.44
6. Step 6: Final answer
   x = 1,468.12