Finding the Third Proportional to 51,615 and 72,687

Step by Step Solution

1. Step 1: Write the proportion equation
   51,615 : 72,687 = 72,687 : x
2. Step 2: Convert to fraction form
   51,615/72,687 = 72,687/x
3. Step 3: Cross multiply
   51,615x = 72,687 × 72,687
4. Step 4: Simplify right side
   51,615x = 5,283,399,969
5. Step 5: Solve for x
   x = 5,283,399,969/51,615
6. Step 6: Final answer
   x = 102,361.72