Finding the Fourth Proportional to 1,997.35, 2,756.61 and 1,439.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,997.35 : 2,756.61 = 1,439.67 : x
2. Step 2: Convert to fraction form
   1,997.35/2,756.61 = 1,439.67/x
3. Step 3: Cross multiply
   1,997.35x = 2,756.61 × 1,439.67
4. Step 4: Simplify right side
   1,997.35x = 3,968,608.72
5. Step 5: Solve for x
   x = 3,968,608.72/1,997.35
6. Step 6: Final answer
   x = 1,986.94