Finding the Third Proportional to 10,426.50 and 21,280.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,426.50 : 21,280.50 = 21,280.50 : x
2. Step 2: Convert to fraction form
   10,426.50/21,280.50 = 21,280.50/x
3. Step 3: Cross multiply
   10,426.50x = 21,280.50 × 21,280.50
4. Step 4: Simplify right side
   10,426.50x = 452,859,680.25
5. Step 5: Solve for x
   x = 452,859,680.25/10,426.50
6. Step 6: Final answer
   x = 43,433.53