Finding the Fourth Proportional to 1,321.72, 1,984.52 and 1,298.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.72 : 1,984.52 = 1,298.39 : x
2. Step 2: Convert to fraction form
   1,321.72/1,984.52 = 1,298.39/x
3. Step 3: Cross multiply
   1,321.72x = 1,984.52 × 1,298.39
4. Step 4: Simplify right side
   1,321.72x = 2,576,664.51
5. Step 5: Solve for x
   x = 2,576,664.51/1,321.72
6. Step 6: Final answer
   x = 1,949.49