Finding the Third Proportional to 62,615 and 139,223

Step by Step Solution

1. Step 1: Write the proportion equation
   62,615 : 139,223 = 139,223 : x
2. Step 2: Convert to fraction form
   62,615/139,223 = 139,223/x
3. Step 3: Cross multiply
   62,615x = 139,223 × 139,223
4. Step 4: Simplify right side
   62,615x = 19,383,043,729
5. Step 5: Solve for x
   x = 19,383,043,729/62,615
6. Step 6: Final answer
   x = 309,559.11