Finding the Third Proportional to 13,830 and 20,779.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,830 : 20,779.50 = 20,779.50 : x
2. Step 2: Convert to fraction form
   13,830/20,779.50 = 20,779.50/x
3. Step 3: Cross multiply
   13,830x = 20,779.50 × 20,779.50
4. Step 4: Simplify right side
   13,830x = 431,787,620.25
5. Step 5: Solve for x
   x = 431,787,620.25/13,830
6. Step 6: Final answer
   x = 31,221.09