Finding the Third Proportional to 301,818 and 639,613.50

Step by Step Solution

1. Step 1: Write the proportion equation
   301,818 : 639,613.50 = 639,613.50 : x
2. Step 2: Convert to fraction form
   301,818/639,613.50 = 639,613.50/x
3. Step 3: Cross multiply
   301,818x = 639,613.50 × 639,613.50
4. Step 4: Simplify right side
   301,818x = 409,105,429,382.25
5. Step 5: Solve for x
   x = 409,105,429,382.25/301,818
6. Step 6: Final answer
   x = 1,355,470.61