Finding the Third Proportional to 510,647 and 808,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   510,647 : 808,212.50 = 808,212.50 : x
2. Step 2: Convert to fraction form
   510,647/808,212.50 = 808,212.50/x
3. Step 3: Cross multiply
   510,647x = 808,212.50 × 808,212.50
4. Step 4: Simplify right side
   510,647x = 653,207,445,156.25
5. Step 5: Solve for x
   x = 653,207,445,156.25/510,647
6. Step 6: Final answer
   x = 1,279,176.11