Finding the Third Proportional to 142,290 and 310,338

Step by Step Solution

1. Step 1: Write the proportion equation
   142,290 : 310,338 = 310,338 : x
2. Step 2: Convert to fraction form
   142,290/310,338 = 310,338/x
3. Step 3: Cross multiply
   142,290x = 310,338 × 310,338
4. Step 4: Simplify right side
   142,290x = 96,309,674,244
5. Step 5: Solve for x
   x = 96,309,674,244/142,290
6. Step 6: Final answer
   x = 676,854.83