Finding the Fourth Proportional to 2,632.49, 3,947.40 and 987.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,632.49 : 3,947.40 = 987.87 : x
2. Step 2: Convert to fraction form
   2,632.49/3,947.40 = 987.87/x
3. Step 3: Cross multiply
   2,632.49x = 3,947.40 × 987.87
4. Step 4: Simplify right side
   2,632.49x = 3,899,527.91
5. Step 5: Solve for x
   x = 3,899,527.91/2,632.49
6. Step 6: Final answer
   x = 1,481.31