Finding the Third Proportional to 10,611.50 and 20,954.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,611.50 : 20,954.50 = 20,954.50 : x
2. Step 2: Convert to fraction form
   10,611.50/20,954.50 = 20,954.50/x
3. Step 3: Cross multiply
   10,611.50x = 20,954.50 × 20,954.50
4. Step 4: Simplify right side
   10,611.50x = 439,091,070.25
5. Step 5: Solve for x
   x = 439,091,070.25/10,611.50
6. Step 6: Final answer
   x = 41,378.79