Finding the Third Proportional to 155,518.50 and 317,598.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,518.50 : 317,598.50 = 317,598.50 : x
2. Step 2: Convert to fraction form
   155,518.50/317,598.50 = 317,598.50/x
3. Step 3: Cross multiply
   155,518.50x = 317,598.50 × 317,598.50
4. Step 4: Simplify right side
   155,518.50x = 100,868,807,202.25
5. Step 5: Solve for x
   x = 100,868,807,202.25/155,518.50
6. Step 6: Final answer
   x = 648,596.84