Finding the Third Proportional to 198,126 and 386,329.50

Step by Step Solution

1. Step 1: Write the proportion equation
   198,126 : 386,329.50 = 386,329.50 : x
2. Step 2: Convert to fraction form
   198,126/386,329.50 = 386,329.50/x
3. Step 3: Cross multiply
   198,126x = 386,329.50 × 386,329.50
4. Step 4: Simplify right side
   198,126x = 149,250,482,570.25
5. Step 5: Solve for x
   x = 149,250,482,570.25/198,126
6. Step 6: Final answer
   x = 753,310.94