Finding the Fourth Proportional to 2,630.90, 3,945.81 and 987.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.90 : 3,945.81 = 987.41 : x
2. Step 2: Convert to fraction form
   2,630.90/3,945.81 = 987.41/x
3. Step 3: Cross multiply
   2,630.90x = 3,945.81 × 987.41
4. Step 4: Simplify right side
   2,630.90x = 3,896,145.82
5. Step 5: Solve for x
   x = 3,896,145.82/2,630.90
6. Step 6: Final answer
   x = 1,480.92