Finding the Third Proportional to 10,200 and 21,615

Step by Step Solution

1. Step 1: Write the proportion equation
   10,200 : 21,615 = 21,615 : x
2. Step 2: Convert to fraction form
   10,200/21,615 = 21,615/x
3. Step 3: Cross multiply
   10,200x = 21,615 × 21,615
4. Step 4: Simplify right side
   10,200x = 467,208,225
5. Step 5: Solve for x
   x = 467,208,225/10,200
6. Step 6: Final answer
   x = 45,804.73