Finding the Fourth Proportional to 2,630.36, 3,945.06 and 986.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.36 : 3,945.06 = 986.57 : x
2. Step 2: Convert to fraction form
   2,630.36/3,945.06 = 986.57/x
3. Step 3: Cross multiply
   2,630.36x = 3,945.06 × 986.57
4. Step 4: Simplify right side
   2,630.36x = 3,892,058.12
5. Step 5: Solve for x
   x = 3,892,058.12/2,630.36
6. Step 6: Final answer
   x = 1,479.67