Finding the Third Proportional to 10,991 and 21,442

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991 : 21,442 = 21,442 : x
2. Step 2: Convert to fraction form
   10,991/21,442 = 21,442/x
3. Step 3: Cross multiply
   10,991x = 21,442 × 21,442
4. Step 4: Simplify right side
   10,991x = 459,759,364
5. Step 5: Solve for x
   x = 459,759,364/10,991
6. Step 6: Final answer
   x = 41,830.53