Finding the Fourth Proportional to 2,630.47, 3,945.30 and 986.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.47 : 3,945.30 = 986.80 : x
2. Step 2: Convert to fraction form
   2,630.47/3,945.30 = 986.80/x
3. Step 3: Cross multiply
   2,630.47x = 3,945.30 × 986.80
4. Step 4: Simplify right side
   2,630.47x = 3,893,222.04
5. Step 5: Solve for x
   x = 3,893,222.04/2,630.47
6. Step 6: Final answer
   x = 1,480.05