Finding the Third Proportional to 87,396.50 and 139,420

Step by Step Solution

1. Step 1: Write the proportion equation
   87,396.50 : 139,420 = 139,420 : x
2. Step 2: Convert to fraction form
   87,396.50/139,420 = 139,420/x
3. Step 3: Cross multiply
   87,396.50x = 139,420 × 139,420
4. Step 4: Simplify right side
   87,396.50x = 19,437,936,400
5. Step 5: Solve for x
   x = 19,437,936,400/87,396.50
6. Step 6: Final answer
   x = 222,410.92