Finding the Fourth Proportional to 1,438.89, 1,986.15 and 997.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.89 : 1,986.15 = 997.37 : x
2. Step 2: Convert to fraction form
   1,438.89/1,986.15 = 997.37/x
3. Step 3: Cross multiply
   1,438.89x = 1,986.15 × 997.37
4. Step 4: Simplify right side
   1,438.89x = 1,980,926.43
5. Step 5: Solve for x
   x = 1,980,926.43/1,438.89
6. Step 6: Final answer
   x = 1,376.70