Finding the Third Proportional to 9,815.50 and 21,272

Step by Step Solution

1. Step 1: Write the proportion equation
   9,815.50 : 21,272 = 21,272 : x
2. Step 2: Convert to fraction form
   9,815.50/21,272 = 21,272/x
3. Step 3: Cross multiply
   9,815.50x = 21,272 × 21,272
4. Step 4: Simplify right side
   9,815.50x = 452,497,984
5. Step 5: Solve for x
   x = 452,497,984/9,815.50
6. Step 6: Final answer
   x = 46,100.35