Finding the Fourth Proportional to 3,320.16, 4,978.98 and 979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,320.16 : 4,978.98 = 979.50 : x
2. Step 2: Convert to fraction form
   3,320.16/4,978.98 = 979.50/x
3. Step 3: Cross multiply
   3,320.16x = 4,978.98 × 979.50
4. Step 4: Simplify right side
   3,320.16x = 4,876,910.91
5. Step 5: Solve for x
   x = 4,876,910.91/3,320.16
6. Step 6: Final answer
   x = 1,468.88