Finding the Third Proportional to 12,489.19 and 21,196.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,489.19 : 21,196.69 = 21,196.69 : x
2. Step 2: Convert to fraction form
   12,489.19/21,196.69 = 21,196.69/x
3. Step 3: Cross multiply
   12,489.19x = 21,196.69 × 21,196.69
4. Step 4: Simplify right side
   12,489.19x = 449,299,560.97
5. Step 5: Solve for x
   x = 449,299,560.97/12,489.19
6. Step 6: Final answer
   x = 35,975.08