Finding the Third Proportional to 129,009 and 199,345.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,009 : 199,345.50 = 199,345.50 : x
2. Step 2: Convert to fraction form
   129,009/199,345.50 = 199,345.50/x
3. Step 3: Cross multiply
   129,009x = 199,345.50 × 199,345.50
4. Step 4: Simplify right side
   129,009x = 39,738,628,370.25
5. Step 5: Solve for x
   x = 39,738,628,370.25/129,009
6. Step 6: Final answer
   x = 308,029.89