Finding the Third Proportional to 21,679.50 and 38,847.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,679.50 : 38,847.75 = 38,847.75 : x
2. Step 2: Convert to fraction form
   21,679.50/38,847.75 = 38,847.75/x
3. Step 3: Cross multiply
   21,679.50x = 38,847.75 × 38,847.75
4. Step 4: Simplify right side
   21,679.50x = 1,509,147,680.06
5. Step 5: Solve for x
   x = 1,509,147,680.06/21,679.50
6. Step 6: Final answer
   x = 69,611.74