Finding the Third Proportional to 131,985 and 212,505

Step by Step Solution

1. Step 1: Write the proportion equation
   131,985 : 212,505 = 212,505 : x
2. Step 2: Convert to fraction form
   131,985/212,505 = 212,505/x
3. Step 3: Cross multiply
   131,985x = 212,505 × 212,505
4. Step 4: Simplify right side
   131,985x = 45,158,375,025
5. Step 5: Solve for x
   x = 45,158,375,025/131,985
6. Step 6: Final answer
   x = 342,147.78