Finding the Third Proportional to 513,711 and 818,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   513,711 : 818,131.50 = 818,131.50 : x
2. Step 2: Convert to fraction form
   513,711/818,131.50 = 818,131.50/x
3. Step 3: Cross multiply
   513,711x = 818,131.50 × 818,131.50
4. Step 4: Simplify right side
   513,711x = 669,339,151,292.25
5. Step 5: Solve for x
   x = 669,339,151,292.25/513,711
6. Step 6: Final answer
   x = 1,302,948.84