Finding the Third Proportional to 21,865.50 and 30,631.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,865.50 : 30,631.50 = 30,631.50 : x
2. Step 2: Convert to fraction form
   21,865.50/30,631.50 = 30,631.50/x
3. Step 3: Cross multiply
   21,865.50x = 30,631.50 × 30,631.50
4. Step 4: Simplify right side
   21,865.50x = 938,288,792.25
5. Step 5: Solve for x
   x = 938,288,792.25/21,865.50
6. Step 6: Final answer
   x = 42,911.84