Finding the Third Proportional to 139,416 and 215,422

Step by Step Solution

1. Step 1: Write the proportion equation
   139,416 : 215,422 = 215,422 : x
2. Step 2: Convert to fraction form
   139,416/215,422 = 215,422/x
3. Step 3: Cross multiply
   139,416x = 215,422 × 215,422
4. Step 4: Simplify right side
   139,416x = 46,406,638,084
5. Step 5: Solve for x
   x = 46,406,638,084/139,416
6. Step 6: Final answer
   x = 332,864.51