Finding the Third Proportional to 9,978 and 14,528

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978 : 14,528 = 14,528 : x
2. Step 2: Convert to fraction form
   9,978/14,528 = 14,528/x
3. Step 3: Cross multiply
   9,978x = 14,528 × 14,528
4. Step 4: Simplify right side
   9,978x = 211,062,784
5. Step 5: Solve for x
   x = 211,062,784/9,978
6. Step 6: Final answer
   x = 21,152.81