Finding the Third Proportional to 20,429 and 42,729.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,429 : 42,729.50 = 42,729.50 : x
2. Step 2: Convert to fraction form
   20,429/42,729.50 = 42,729.50/x
3. Step 3: Cross multiply
   20,429x = 42,729.50 × 42,729.50
4. Step 4: Simplify right side
   20,429x = 1,825,810,170.25
5. Step 5: Solve for x
   x = 1,825,810,170.25/20,429
6. Step 6: Final answer
   x = 89,373.45