Finding the Third Proportional to 8,911 and 21,008.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911 : 21,008.50 = 21,008.50 : x
2. Step 2: Convert to fraction form
   8,911/21,008.50 = 21,008.50/x
3. Step 3: Cross multiply
   8,911x = 21,008.50 × 21,008.50
4. Step 4: Simplify right side
   8,911x = 441,357,072.25
5. Step 5: Solve for x
   x = 441,357,072.25/8,911
6. Step 6: Final answer
   x = 49,529.47