Finding the Third Proportional to 3,345.75 and 7,221.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,345.75 : 7,221.38 = 7,221.38 : x
2. Step 2: Convert to fraction form
   3,345.75/7,221.38 = 7,221.38/x
3. Step 3: Cross multiply
   3,345.75x = 7,221.38 × 7,221.38
4. Step 4: Simplify right side
   3,345.75x = 52,148,256.89
5. Step 5: Solve for x
   x = 52,148,256.89/3,345.75
6. Step 6: Final answer
   x = 15,586.42