Finding the Fourth Proportional to 2,631.94, 3,948.03 and 987.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.94 : 3,948.03 = 987.94 : x
2. Step 2: Convert to fraction form
   2,631.94/3,948.03 = 987.94/x
3. Step 3: Cross multiply
   2,631.94x = 3,948.03 × 987.94
4. Step 4: Simplify right side
   2,631.94x = 3,900,416.76
5. Step 5: Solve for x
   x = 3,900,416.76/2,631.94
6. Step 6: Final answer
   x = 1,481.96