Finding the Fourth Proportional to 2,086.40, 3,125.33 and 987.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.40 : 3,125.33 = 987.43 : x
2. Step 2: Convert to fraction form
   2,086.40/3,125.33 = 987.43/x
3. Step 3: Cross multiply
   2,086.40x = 3,125.33 × 987.43
4. Step 4: Simplify right side
   2,086.40x = 3,086,028.98
5. Step 5: Solve for x
   x = 3,086,028.98/2,086.40
6. Step 6: Final answer
   x = 1,479.12