Finding the Fourth Proportional to 2,630.20, 3,942.76 and 986.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.20 : 3,942.76 = 986.08 : x
2. Step 2: Convert to fraction form
   2,630.20/3,942.76 = 986.08/x
3. Step 3: Cross multiply
   2,630.20x = 3,942.76 × 986.08
4. Step 4: Simplify right side
   2,630.20x = 3,887,876.78
5. Step 5: Solve for x
   x = 3,887,876.78/2,630.20
6. Step 6: Final answer
   x = 1,478.17