Finding the Third Proportional to 9,978 and 15,316

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978 : 15,316 = 15,316 : x
2. Step 2: Convert to fraction form
   9,978/15,316 = 15,316/x
3. Step 3: Cross multiply
   9,978x = 15,316 × 15,316
4. Step 4: Simplify right side
   9,978x = 234,579,856
5. Step 5: Solve for x
   x = 234,579,856/9,978
6. Step 6: Final answer
   x = 23,509.71