Finding the Third Proportional to 9,908 and 20,516.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,908 : 20,516.50 = 20,516.50 : x
2. Step 2: Convert to fraction form
   9,908/20,516.50 = 20,516.50/x
3. Step 3: Cross multiply
   9,908x = 20,516.50 × 20,516.50
4. Step 4: Simplify right side
   9,908x = 420,926,772.25
5. Step 5: Solve for x
   x = 420,926,772.25/9,908
6. Step 6: Final answer
   x = 42,483.53