Finding the Fourth Proportional to 2,144.31, 3,214.02 and 987.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.31 : 3,214.02 = 987.63 : x
2. Step 2: Convert to fraction form
   2,144.31/3,214.02 = 987.63/x
3. Step 3: Cross multiply
   2,144.31x = 3,214.02 × 987.63
4. Step 4: Simplify right side
   2,144.31x = 3,174,262.57
5. Step 5: Solve for x
   x = 3,174,262.57/2,144.31
6. Step 6: Final answer
   x = 1,480.32