Finding the Third Proportional to 199,128 and 315,463.50

Step by Step Solution

1. Step 1: Write the proportion equation
   199,128 : 315,463.50 = 315,463.50 : x
2. Step 2: Convert to fraction form
   199,128/315,463.50 = 315,463.50/x
3. Step 3: Cross multiply
   199,128x = 315,463.50 × 315,463.50
4. Step 4: Simplify right side
   199,128x = 99,517,219,832.25
5. Step 5: Solve for x
   x = 99,517,219,832.25/199,128
6. Step 6: Final answer
   x = 499,765.07