Finding the Third Proportional to 129,169.69 and 142,906.78

Step by Step Solution

1. Step 1: Write the proportion equation
   129,169.69 : 142,906.78 = 142,906.78 : x
2. Step 2: Convert to fraction form
   129,169.69/142,906.78 = 142,906.78/x
3. Step 3: Cross multiply
   129,169.69x = 142,906.78 × 142,906.78
4. Step 4: Simplify right side
   129,169.69x = 20,422,348,127.24
5. Step 5: Solve for x
   x = 20,422,348,127.24/129,169.69
6. Step 6: Final answer
   x = 158,104.80