Finding the Third Proportional to 9,942.75 and 21,409.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,942.75 : 21,409.31 = 21,409.31 : x
2. Step 2: Convert to fraction form
   9,942.75/21,409.31 = 21,409.31/x
3. Step 3: Cross multiply
   9,942.75x = 21,409.31 × 21,409.31
4. Step 4: Simplify right side
   9,942.75x = 458,358,661.72
5. Step 5: Solve for x
   x = 458,358,661.72/9,942.75
6. Step 6: Final answer
   x = 46,099.79