Finding the Third Proportional to 21,990.75 and 51,859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,990.75 : 51,859.50 = 51,859.50 : x
2. Step 2: Convert to fraction form
   21,990.75/51,859.50 = 51,859.50/x
3. Step 3: Cross multiply
   21,990.75x = 51,859.50 × 51,859.50
4. Step 4: Simplify right side
   21,990.75x = 2,689,407,740.25
5. Step 5: Solve for x
   x = 2,689,407,740.25/21,990.75
6. Step 6: Final answer
   x = 122,297.23