Finding the Third Proportional to 200,439 and 308,218.50

Step by Step Solution

1. Step 1: Write the proportion equation
   200,439 : 308,218.50 = 308,218.50 : x
2. Step 2: Convert to fraction form
   200,439/308,218.50 = 308,218.50/x
3. Step 3: Cross multiply
   200,439x = 308,218.50 × 308,218.50
4. Step 4: Simplify right side
   200,439x = 94,998,643,742.25
5. Step 5: Solve for x
   x = 94,998,643,742.25/200,439
6. Step 6: Final answer
   x = 473,952.89