Finding the Fourth Proportional to 2,629.76, 3,945.40 and 986.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.76 : 3,945.40 = 986.43 : x
2. Step 2: Convert to fraction form
   2,629.76/3,945.40 = 986.43/x
3. Step 3: Cross multiply
   2,629.76x = 3,945.40 × 986.43
4. Step 4: Simplify right side
   2,629.76x = 3,891,858.46
5. Step 5: Solve for x
   x = 3,891,858.46/2,629.76
6. Step 6: Final answer
   x = 1,479.93