Finding the Third Proportional to 216,126.75 and 347,256

Step by Step Solution

1. Step 1: Write the proportion equation
   216,126.75 : 347,256 = 347,256 : x
2. Step 2: Convert to fraction form
   216,126.75/347,256 = 347,256/x
3. Step 3: Cross multiply
   216,126.75x = 347,256 × 347,256
4. Step 4: Simplify right side
   216,126.75x = 120,586,729,536
5. Step 5: Solve for x
   x = 120,586,729,536/216,126.75
6. Step 6: Final answer
   x = 557,944.49