Finding the Third Proportional to 5,391 and 12,728.25

Step by Step Solution

1. Step 1: Write the proportion equation
   5,391 : 12,728.25 = 12,728.25 : x
2. Step 2: Convert to fraction form
   5,391/12,728.25 = 12,728.25/x
3. Step 3: Cross multiply
   5,391x = 12,728.25 × 12,728.25
4. Step 4: Simplify right side
   5,391x = 162,008,348.06
5. Step 5: Solve for x
   x = 162,008,348.06/5,391
6. Step 6: Final answer
   x = 30,051.63