Finding the Third Proportional to 198,407 and 299,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   198,407 : 299,399.50 = 299,399.50 : x
2. Step 2: Convert to fraction form
   198,407/299,399.50 = 299,399.50/x
3. Step 3: Cross multiply
   198,407x = 299,399.50 × 299,399.50
4. Step 4: Simplify right side
   198,407x = 89,640,060,600.25
5. Step 5: Solve for x
   x = 89,640,060,600.25/198,407
6. Step 6: Final answer
   x = 451,798.88