Finding the Fourth Proportional to 2,630.88, 3,945.78 and 986.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.88 : 3,945.78 = 986.52 : x
2. Step 2: Convert to fraction form
   2,630.88/3,945.78 = 986.52/x
3. Step 3: Cross multiply
   2,630.88x = 3,945.78 × 986.52
4. Step 4: Simplify right side
   2,630.88x = 3,892,590.89
5. Step 5: Solve for x
   x = 3,892,590.89/2,630.88
6. Step 6: Final answer
   x = 1,479.58