Finding the Fourth Proportional to 1,439.37, 1,985.31 and 997.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.37 : 1,985.31 = 997.41 : x
2. Step 2: Convert to fraction form
   1,439.37/1,985.31 = 997.41/x
3. Step 3: Cross multiply
   1,439.37x = 1,985.31 × 997.41
4. Step 4: Simplify right side
   1,439.37x = 1,980,175.49
5. Step 5: Solve for x
   x = 1,980,175.49/1,439.37
6. Step 6: Final answer
   x = 1,375.72