Finding the Third Proportional to 142,116,408 and 310,978,689

Step by Step Solution

1. Step 1: Write the proportion equation
   142,116,408 : 310,978,689 = 310,978,689 : x
2. Step 2: Convert to fraction form
   142,116,408/310,978,689 = 310,978,689/x
3. Step 3: Cross multiply
   142,116,408x = 310,978,689 × 310,978,689
4. Step 4: Simplify right side
   142,116,408x = 96,707,745,012,158,720
5. Step 5: Solve for x
   x = 96,707,745,012,158,720/142,116,408
6. Step 6: Final answer
   x = 680,482,615.44