Finding the Third Proportional to 142,480.75 and 309,655

Step by Step Solution

1. Step 1: Write the proportion equation
   142,480.75 : 309,655 = 309,655 : x
2. Step 2: Convert to fraction form
   142,480.75/309,655 = 309,655/x
3. Step 3: Cross multiply
   142,480.75x = 309,655 × 309,655
4. Step 4: Simplify right side
   142,480.75x = 95,886,219,025
5. Step 5: Solve for x
   x = 95,886,219,025/142,480.75
6. Step 6: Final answer
   x = 672,976.66