Finding the Third Proportional to 20,099.69 and 42,429.19

Step by Step Solution

1. Step 1: Write the proportion equation
   20,099.69 : 42,429.19 = 42,429.19 : x
2. Step 2: Convert to fraction form
   20,099.69/42,429.19 = 42,429.19/x
3. Step 3: Cross multiply
   20,099.69x = 42,429.19 × 42,429.19
4. Step 4: Simplify right side
   20,099.69x = 1,800,235,951.91
5. Step 5: Solve for x
   x = 1,800,235,951.91/20,099.69
6. Step 6: Final answer
   x = 89,565.37