Finding the Third Proportional to 2,205 and 5,316

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205 : 5,316 = 5,316 : x
2. Step 2: Convert to fraction form
   2,205/5,316 = 5,316/x
3. Step 3: Cross multiply
   2,205x = 5,316 × 5,316
4. Step 4: Simplify right side
   2,205x = 28,259,856
5. Step 5: Solve for x
   x = 28,259,856/2,205
6. Step 6: Final answer
   x = 12,816.26