Finding the Third Proportional to 207,091.50 and 422,889

Step by Step Solution

1. Step 1: Write the proportion equation
   207,091.50 : 422,889 = 422,889 : x
2. Step 2: Convert to fraction form
   207,091.50/422,889 = 422,889/x
3. Step 3: Cross multiply
   207,091.50x = 422,889 × 422,889
4. Step 4: Simplify right side
   207,091.50x = 178,835,106,321
5. Step 5: Solve for x
   x = 178,835,106,321/207,091.50
6. Step 6: Final answer
   x = 863,555.99