Finding the Third Proportional to 19,138.78 and 28,728.42

Step by Step Solution

1. Step 1: Write the proportion equation
   19,138.78 : 28,728.42 = 28,728.42 : x
2. Step 2: Convert to fraction form
   19,138.78/28,728.42 = 28,728.42/x
3. Step 3: Cross multiply
   19,138.78x = 28,728.42 × 28,728.42
4. Step 4: Simplify right side
   19,138.78x = 825,322,223.43
5. Step 5: Solve for x
   x = 825,322,223.43/19,138.78
6. Step 6: Final answer
   x = 43,123.03