Finding the Third Proportional to 142,989.75 and 308,144.25

Step by Step Solution

1. Step 1: Write the proportion equation
   142,989.75 : 308,144.25 = 308,144.25 : x
2. Step 2: Convert to fraction form
   142,989.75/308,144.25 = 308,144.25/x
3. Step 3: Cross multiply
   142,989.75x = 308,144.25 × 308,144.25
4. Step 4: Simplify right side
   142,989.75x = 94,952,878,808.06
5. Step 5: Solve for x
   x = 94,952,878,808.06/142,989.75
6. Step 6: Final answer
   x = 664,053.74