Finding the Third Proportional to 87,440 and 139,042

Step by Step Solution

1. Step 1: Write the proportion equation
   87,440 : 139,042 = 139,042 : x
2. Step 2: Convert to fraction form
   87,440/139,042 = 139,042/x
3. Step 3: Cross multiply
   87,440x = 139,042 × 139,042
4. Step 4: Simplify right side
   87,440x = 19,332,677,764
5. Step 5: Solve for x
   x = 19,332,677,764/87,440
6. Step 6: Final answer
   x = 221,096.50