Finding the Third Proportional to 142,044.50 and 315,619

Step by Step Solution

1. Step 1: Write the proportion equation
   142,044.50 : 315,619 = 315,619 : x
2. Step 2: Convert to fraction form
   142,044.50/315,619 = 315,619/x
3. Step 3: Cross multiply
   142,044.50x = 315,619 × 315,619
4. Step 4: Simplify right side
   142,044.50x = 99,615,353,161
5. Step 5: Solve for x
   x = 99,615,353,161/142,044.50
6. Step 6: Final answer
   x = 701,296.80