Finding the Third Proportional to 139,056 and 215,416

Step by Step Solution

1. Step 1: Write the proportion equation
   139,056 : 215,416 = 215,416 : x
2. Step 2: Convert to fraction form
   139,056/215,416 = 215,416/x
3. Step 3: Cross multiply
   139,056x = 215,416 × 215,416
4. Step 4: Simplify right side
   139,056x = 46,404,053,056
5. Step 5: Solve for x
   x = 46,404,053,056/139,056
6. Step 6: Final answer
   x = 333,707.66