Finding the Third Proportional to 147,078.28 and 317,484.56

Step by Step Solution

1. Step 1: Write the proportion equation
   147,078.28 : 317,484.56 = 317,484.56 : x
2. Step 2: Convert to fraction form
   147,078.28/317,484.56 = 317,484.56/x
3. Step 3: Cross multiply
   147,078.28x = 317,484.56 × 317,484.56
4. Step 4: Simplify right side
   147,078.28x = 100,796,447,425.82
5. Step 5: Solve for x
   x = 100,796,447,425.82/147,078.28
6. Step 6: Final answer
   x = 685,325.17