Finding the Third Proportional to 131,290.50 and 286,345

Step by Step Solution

1. Step 1: Write the proportion equation
   131,290.50 : 286,345 = 286,345 : x
2. Step 2: Convert to fraction form
   131,290.50/286,345 = 286,345/x
3. Step 3: Cross multiply
   131,290.50x = 286,345 × 286,345
4. Step 4: Simplify right side
   131,290.50x = 81,993,459,025
5. Step 5: Solve for x
   x = 81,993,459,025/131,290.50
6. Step 6: Final answer
   x = 624,519.36