Finding the Third Proportional to 142,274 and 310,788

Step by Step Solution

1. Step 1: Write the proportion equation
   142,274 : 310,788 = 310,788 : x
2. Step 2: Convert to fraction form
   142,274/310,788 = 310,788/x
3. Step 3: Cross multiply
   142,274x = 310,788 × 310,788
4. Step 4: Simplify right side
   142,274x = 96,589,180,944
5. Step 5: Solve for x
   x = 96,589,180,944/142,274
6. Step 6: Final answer
   x = 678,895.52