Finding the Third Proportional to 131,439 and 285,022.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,439 : 285,022.50 = 285,022.50 : x
2. Step 2: Convert to fraction form
   131,439/285,022.50 = 285,022.50/x
3. Step 3: Cross multiply
   131,439x = 285,022.50 × 285,022.50
4. Step 4: Simplify right side
   131,439x = 81,237,825,506.25
5. Step 5: Solve for x
   x = 81,237,825,506.25/131,439
6. Step 6: Final answer
   x = 618,064.85