Finding the Third Proportional to 142,078.50 and 310,914

Step by Step Solution

1. Step 1: Write the proportion equation
   142,078.50 : 310,914 = 310,914 : x
2. Step 2: Convert to fraction form
   142,078.50/310,914 = 310,914/x
3. Step 3: Cross multiply
   142,078.50x = 310,914 × 310,914
4. Step 4: Simplify right side
   142,078.50x = 96,667,515,396
5. Step 5: Solve for x
   x = 96,667,515,396/142,078.50
6. Step 6: Final answer
   x = 680,381.02