Finding the Third Proportional to 528,817 and 805,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   528,817 : 805,618.50 = 805,618.50 : x
2. Step 2: Convert to fraction form
   528,817/805,618.50 = 805,618.50/x
3. Step 3: Cross multiply
   528,817x = 805,618.50 × 805,618.50
4. Step 4: Simplify right side
   528,817x = 649,021,167,542.25
5. Step 5: Solve for x
   x = 649,021,167,542.25/528,817
6. Step 6: Final answer
   x = 1,227,307.68