Finding the Third Proportional to 128,775 and 199,393.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,775 : 199,393.50 = 199,393.50 : x
2. Step 2: Convert to fraction form
   128,775/199,393.50 = 199,393.50/x
3. Step 3: Cross multiply
   128,775x = 199,393.50 × 199,393.50
4. Step 4: Simplify right side
   128,775x = 39,757,767,842.25
5. Step 5: Solve for x
   x = 39,757,767,842.25/128,775
6. Step 6: Final answer
   x = 308,738.25