Finding the Third Proportional to 87,474 and 139,256

Step by Step Solution

1. Step 1: Write the proportion equation
   87,474 : 139,256 = 139,256 : x
2. Step 2: Convert to fraction form
   87,474/139,256 = 139,256/x
3. Step 3: Cross multiply
   87,474x = 139,256 × 139,256
4. Step 4: Simplify right side
   87,474x = 19,392,233,536
5. Step 5: Solve for x
   x = 19,392,233,536/87,474
6. Step 6: Final answer
   x = 221,691.40