Finding the Third Proportional to 20,859 and 42,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,859 : 42,442.50 = 42,442.50 : x
2. Step 2: Convert to fraction form
   20,859/42,442.50 = 42,442.50/x
3. Step 3: Cross multiply
   20,859x = 42,442.50 × 42,442.50
4. Step 4: Simplify right side
   20,859x = 1,801,365,806.25
5. Step 5: Solve for x
   x = 1,801,365,806.25/20,859
6. Step 6: Final answer
   x = 86,359.16