Finding the Third Proportional to 210,078.28 and 317,618.72

Step by Step Solution

1. Step 1: Write the proportion equation
   210,078.28 : 317,618.72 = 317,618.72 : x
2. Step 2: Convert to fraction form
   210,078.28/317,618.72 = 317,618.72/x
3. Step 3: Cross multiply
   210,078.28x = 317,618.72 × 317,618.72
4. Step 4: Simplify right side
   210,078.28x = 100,881,650,500.39
5. Step 5: Solve for x
   x = 100,881,650,500.39/210,078.28
6. Step 6: Final answer
   x = 480,209.81