Finding the Third Proportional to 209,047.50 and 308,650.50

Step by Step Solution

1. Step 1: Write the proportion equation
   209,047.50 : 308,650.50 = 308,650.50 : x
2. Step 2: Convert to fraction form
   209,047.50/308,650.50 = 308,650.50/x
3. Step 3: Cross multiply
   209,047.50x = 308,650.50 × 308,650.50
4. Step 4: Simplify right side
   209,047.50x = 95,265,131,150.25
5. Step 5: Solve for x
   x = 95,265,131,150.25/209,047.50
6. Step 6: Final answer
   x = 455,710.45