Finding the Third Proportional to 142,917 and 310,453.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,917 : 310,453.50 = 310,453.50 : x
2. Step 2: Convert to fraction form
   142,917/310,453.50 = 310,453.50/x
3. Step 3: Cross multiply
   142,917x = 310,453.50 × 310,453.50
4. Step 4: Simplify right side
   142,917x = 96,381,375,662.25
5. Step 5: Solve for x
   x = 96,381,375,662.25/142,917
6. Step 6: Final answer
   x = 674,387.06