Finding the Third Proportional to 15,779.25 and 21,399.75

Step by Step Solution

1. Step 1: Write the proportion equation
   15,779.25 : 21,399.75 = 21,399.75 : x
2. Step 2: Convert to fraction form
   15,779.25/21,399.75 = 21,399.75/x
3. Step 3: Cross multiply
   15,779.25x = 21,399.75 × 21,399.75
4. Step 4: Simplify right side
   15,779.25x = 457,949,300.06
5. Step 5: Solve for x
   x = 457,949,300.06/15,779.25
6. Step 6: Final answer
   x = 29,022.25