Finding the Third Proportional to 1,728.19 and 2,680.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.19 : 2,680.31 = 2,680.31 : x
2. Step 2: Convert to fraction form
   1,728.19/2,680.31 = 2,680.31/x
3. Step 3: Cross multiply
   1,728.19x = 2,680.31 × 2,680.31
4. Step 4: Simplify right side
   1,728.19x = 7,184,075.10
5. Step 5: Solve for x
   x = 7,184,075.10/1,728.19
6. Step 6: Final answer
   x = 4,157.00