Finding the Third Proportional to 1,912.78 and 4,429.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.78 : 4,429.69 = 4,429.69 : x
2. Step 2: Convert to fraction form
   1,912.78/4,429.69 = 4,429.69/x
3. Step 3: Cross multiply
   1,912.78x = 4,429.69 × 4,429.69
4. Step 4: Simplify right side
   1,912.78x = 19,622,131.35
5. Step 5: Solve for x
   x = 19,622,131.35/1,912.78
6. Step 6: Final answer
   x = 10,258.43