Finding the Third Proportional to 216,067.50 and 286,713

Step by Step Solution

1. Step 1: Write the proportion equation
   216,067.50 : 286,713 = 286,713 : x
2. Step 2: Convert to fraction form
   216,067.50/286,713 = 286,713/x
3. Step 3: Cross multiply
   216,067.50x = 286,713 × 286,713
4. Step 4: Simplify right side
   216,067.50x = 82,204,344,369
5. Step 5: Solve for x
   x = 82,204,344,369/216,067.50
6. Step 6: Final answer
   x = 380,456.78