Finding the Fourth Proportional to 2,631.35, 3,946.51 and 987.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.35 : 3,946.51 = 987.34 : x
2. Step 2: Convert to fraction form
   2,631.35/3,946.51 = 987.34/x
3. Step 3: Cross multiply
   2,631.35x = 3,946.51 × 987.34
4. Step 4: Simplify right side
   2,631.35x = 3,896,544.56
5. Step 5: Solve for x
   x = 3,896,544.56/2,631.35
6. Step 6: Final answer
   x = 1,480.82