Finding the Fourth Proportional to 1,440.37, 1,986.89 and 997.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.37 : 1,986.89 = 997.50 : x
2. Step 2: Convert to fraction form
   1,440.37/1,986.89 = 997.50/x
3. Step 3: Cross multiply
   1,440.37x = 1,986.89 × 997.50
4. Step 4: Simplify right side
   1,440.37x = 1,981,922.78
5. Step 5: Solve for x
   x = 1,981,922.78/1,440.37
6. Step 6: Final answer
   x = 1,375.98