Finding the Third Proportional to 5,172 and 10,615

Step by Step Solution

1. Step 1: Write the proportion equation
   5,172 : 10,615 = 10,615 : x
2. Step 2: Convert to fraction form
   5,172/10,615 = 10,615/x
3. Step 3: Cross multiply
   5,172x = 10,615 × 10,615
4. Step 4: Simplify right side
   5,172x = 112,678,225
5. Step 5: Solve for x
   x = 112,678,225/5,172
6. Step 6: Final answer
   x = 21,786.20