Finding the Third Proportional to 21,991 and 51,860.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,991 : 51,860.50 = 51,860.50 : x
2. Step 2: Convert to fraction form
   21,991/51,860.50 = 51,860.50/x
3. Step 3: Cross multiply
   21,991x = 51,860.50 × 51,860.50
4. Step 4: Simplify right side
   21,991x = 2,689,511,460.25
5. Step 5: Solve for x
   x = 2,689,511,460.25/21,991
6. Step 6: Final answer
   x = 122,300.55