Finding the Third Proportional to 399,636 and 562,837.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,636 : 562,837.50 = 562,837.50 : x
2. Step 2: Convert to fraction form
   399,636/562,837.50 = 562,837.50/x
3. Step 3: Cross multiply
   399,636x = 562,837.50 × 562,837.50
4. Step 4: Simplify right side
   399,636x = 316,786,051,406.25
5. Step 5: Solve for x
   x = 316,786,051,406.25/399,636
6. Step 6: Final answer
   x = 792,686.47