Finding the Third Proportional to 366,917 and 561,318.50

Step by Step Solution

1. Step 1: Write the proportion equation
   366,917 : 561,318.50 = 561,318.50 : x
2. Step 2: Convert to fraction form
   366,917/561,318.50 = 561,318.50/x
3. Step 3: Cross multiply
   366,917x = 561,318.50 × 561,318.50
4. Step 4: Simplify right side
   366,917x = 315,078,458,442.25
5. Step 5: Solve for x
   x = 315,078,458,442.25/366,917
6. Step 6: Final answer
   x = 858,718.62