Finding the Third Proportional to 6,128.78 and 13,229.56

Step by Step Solution

1. Step 1: Write the proportion equation
   6,128.78 : 13,229.56 = 13,229.56 : x
2. Step 2: Convert to fraction form
   6,128.78/13,229.56 = 13,229.56/x
3. Step 3: Cross multiply
   6,128.78x = 13,229.56 × 13,229.56
4. Step 4: Simplify right side
   6,128.78x = 175,021,323.94
5. Step 5: Solve for x
   x = 175,021,323.94/6,128.78
6. Step 6: Final answer
   x = 28,557.28