Finding the Third Proportional to 6,490.75 and 10,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   6,490.75 : 10,128.25 = 10,128.25 : x
2. Step 2: Convert to fraction form
   6,490.75/10,128.25 = 10,128.25/x
3. Step 3: Cross multiply
   6,490.75x = 10,128.25 × 10,128.25
4. Step 4: Simplify right side
   6,490.75x = 102,581,448.06
5. Step 5: Solve for x
   x = 102,581,448.06/6,490.75
6. Step 6: Final answer
   x = 15,804.25