Finding the Third Proportional to 128,577.38 and 142,929.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,577.38 : 142,929.56 = 142,929.56 : x
2. Step 2: Convert to fraction form
   128,577.38/142,929.56 = 142,929.56/x
3. Step 3: Cross multiply
   128,577.38x = 142,929.56 × 142,929.56
4. Step 4: Simplify right side
   128,577.38x = 20,428,859,836.44
5. Step 5: Solve for x
   x = 20,428,859,836.44/128,577.38
6. Step 6: Final answer
   x = 158,883.78