Finding the Third Proportional to 20,653.50 and 31,420.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,653.50 : 31,420.50 = 31,420.50 : x
2. Step 2: Convert to fraction form
   20,653.50/31,420.50 = 31,420.50/x
3. Step 3: Cross multiply
   20,653.50x = 31,420.50 × 31,420.50
4. Step 4: Simplify right side
   20,653.50x = 987,247,820.25
5. Step 5: Solve for x
   x = 987,247,820.25/20,653.50
6. Step 6: Final answer
   x = 47,800.51