Finding the Third Proportional to 198,777 and 308,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   198,777 : 308,128.50 = 308,128.50 : x
2. Step 2: Convert to fraction form
   198,777/308,128.50 = 308,128.50/x
3. Step 3: Cross multiply
   198,777x = 308,128.50 × 308,128.50
4. Step 4: Simplify right side
   198,777x = 94,943,172,512.25
5. Step 5: Solve for x
   x = 94,943,172,512.25/198,777
6. Step 6: Final answer
   x = 477,636.61