Finding the Third Proportional to 1,398.52 and 2,173.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.52 : 2,173.71 = 2,173.71 : x
2. Step 2: Convert to fraction form
   1,398.52/2,173.71 = 2,173.71/x
3. Step 3: Cross multiply
   1,398.52x = 2,173.71 × 2,173.71
4. Step 4: Simplify right side
   1,398.52x = 4,725,019.24
5. Step 5: Solve for x
   x = 4,725,019.24/1,398.52
6. Step 6: Final answer
   x = 3,378.60