Finding the Third Proportional to 399,963 and 562,519.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,963 : 562,519.50 = 562,519.50 : x
2. Step 2: Convert to fraction form
   399,963/562,519.50 = 562,519.50/x
3. Step 3: Cross multiply
   399,963x = 562,519.50 × 562,519.50
4. Step 4: Simplify right side
   399,963x = 316,428,187,880.25
5. Step 5: Solve for x
   x = 316,428,187,880.25/399,963
6. Step 6: Final answer
   x = 791,143.65