Finding the Fourth Proportional to 2,630.72, 3,944.87 and 986.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.72 : 3,944.87 = 986.09 : x
2. Step 2: Convert to fraction form
   2,630.72/3,944.87 = 986.09/x
3. Step 3: Cross multiply
   2,630.72x = 3,944.87 × 986.09
4. Step 4: Simplify right side
   2,630.72x = 3,889,991.93
5. Step 5: Solve for x
   x = 3,889,991.93/2,630.72
6. Step 6: Final answer
   x = 1,478.68