Finding the Third Proportional to 8,406.28 and 13,429.55

Step by Step Solution

1. Step 1: Write the proportion equation
   8,406.28 : 13,429.55 = 13,429.55 : x
2. Step 2: Convert to fraction form
   8,406.28/13,429.55 = 13,429.55/x
3. Step 3: Cross multiply
   8,406.28x = 13,429.55 × 13,429.55
4. Step 4: Simplify right side
   8,406.28x = 180,352,729.27
5. Step 5: Solve for x
   x = 180,352,729.27/8,406.28
6. Step 6: Final answer
   x = 21,454.52