Finding the Third Proportional to 3,129.75 and 7,410.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,129.75 : 7,410.38 = 7,410.38 : x
2. Step 2: Convert to fraction form
   3,129.75/7,410.38 = 7,410.38/x
3. Step 3: Cross multiply
   3,129.75x = 7,410.38 × 7,410.38
4. Step 4: Simplify right side
   3,129.75x = 54,913,657.64
5. Step 5: Solve for x
   x = 54,913,657.64/3,129.75
6. Step 6: Final answer
   x = 17,545.70