Finding the Third Proportional to 399,462 and 561,874.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,462 : 561,874.50 = 561,874.50 : x
2. Step 2: Convert to fraction form
   399,462/561,874.50 = 561,874.50/x
3. Step 3: Cross multiply
   399,462x = 561,874.50 × 561,874.50
4. Step 4: Simplify right side
   399,462x = 315,702,953,750.25
5. Step 5: Solve for x
   x = 315,702,953,750.25/399,462
6. Step 6: Final answer
   x = 790,320.37