Finding the Third Proportional to 10,215 and 21,985

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215 : 21,985 = 21,985 : x
2. Step 2: Convert to fraction form
   10,215/21,985 = 21,985/x
3. Step 3: Cross multiply
   10,215x = 21,985 × 21,985
4. Step 4: Simplify right side
   10,215x = 483,340,225
5. Step 5: Solve for x
   x = 483,340,225/10,215
6. Step 6: Final answer
   x = 47,316.71