Finding the Third Proportional to 20,245.50 and 42,790.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,245.50 : 42,790.50 = 42,790.50 : x
2. Step 2: Convert to fraction form
   20,245.50/42,790.50 = 42,790.50/x
3. Step 3: Cross multiply
   20,245.50x = 42,790.50 × 42,790.50
4. Step 4: Simplify right side
   20,245.50x = 1,831,026,890.25
5. Step 5: Solve for x
   x = 1,831,026,890.25/20,245.50
6. Step 6: Final answer
   x = 90,441.18