Finding the Fourth Proportional to 1,439.88, 1,987.61 and 908.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.88 : 1,987.61 = 908.67 : x
2. Step 2: Convert to fraction form
   1,439.88/1,987.61 = 908.67/x
3. Step 3: Cross multiply
   1,439.88x = 1,987.61 × 908.67
4. Step 4: Simplify right side
   1,439.88x = 1,806,073.31
5. Step 5: Solve for x
   x = 1,806,073.31/1,439.88
6. Step 6: Final answer
   x = 1,254.33