Finding the Third Proportional to 19,221.68 and 39,707.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,221.68 : 39,707.72 = 39,707.72 : x
2. Step 2: Convert to fraction form
   19,221.68/39,707.72 = 39,707.72/x
3. Step 3: Cross multiply
   19,221.68x = 39,707.72 × 39,707.72
4. Step 4: Simplify right side
   19,221.68x = 1,576,702,928.33
5. Step 5: Solve for x
   x = 1,576,702,928.33/19,221.68
6. Step 6: Final answer
   x = 82,027.32