Finding the Third Proportional to 399,007.69 and 561,193.31

Step by Step Solution

1. Step 1: Write the proportion equation
   399,007.69 : 561,193.31 = 561,193.31 : x
2. Step 2: Convert to fraction form
   399,007.69/561,193.31 = 561,193.31/x
3. Step 3: Cross multiply
   399,007.69x = 561,193.31 × 561,193.31
4. Step 4: Simplify right side
   399,007.69x = 314,937,933,994.72
5. Step 5: Solve for x
   x = 314,937,933,994.72/399,007.69
6. Step 6: Final answer
   x = 789,302.92