Finding the Third Proportional to 128,745 and 199,345.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,745 : 199,345.50 = 199,345.50 : x
2. Step 2: Convert to fraction form
   128,745/199,345.50 = 199,345.50/x
3. Step 3: Cross multiply
   128,745x = 199,345.50 × 199,345.50
4. Step 4: Simplify right side
   128,745x = 39,738,628,370.25
5. Step 5: Solve for x
   x = 39,738,628,370.25/128,745
6. Step 6: Final answer
   x = 308,661.53