Finding the Third Proportional to 291,823.50 and 639,006

Step by Step Solution

1. Step 1: Write the proportion equation
   291,823.50 : 639,006 = 639,006 : x
2. Step 2: Convert to fraction form
   291,823.50/639,006 = 639,006/x
3. Step 3: Cross multiply
   291,823.50x = 639,006 × 639,006
4. Step 4: Simplify right side
   291,823.50x = 408,328,668,036
5. Step 5: Solve for x
   x = 408,328,668,036/291,823.50
6. Step 6: Final answer
   x = 1,399,231.62