Finding the Third Proportional to 131,976 and 212,490

Step by Step Solution

1. Step 1: Write the proportion equation
   131,976 : 212,490 = 212,490 : x
2. Step 2: Convert to fraction form
   131,976/212,490 = 212,490/x
3. Step 3: Cross multiply
   131,976x = 212,490 × 212,490
4. Step 4: Simplify right side
   131,976x = 45,152,000,100
5. Step 5: Solve for x
   x = 45,152,000,100/131,976
6. Step 6: Final answer
   x = 342,122.81