Finding the Third Proportional to 528,989 and 804,555.50

Step by Step Solution

1. Step 1: Write the proportion equation
   528,989 : 804,555.50 = 804,555.50 : x
2. Step 2: Convert to fraction form
   528,989/804,555.50 = 804,555.50/x
3. Step 3: Cross multiply
   528,989x = 804,555.50 × 804,555.50
4. Step 4: Simplify right side
   528,989x = 647,309,552,580.25
5. Step 5: Solve for x
   x = 647,309,552,580.25/528,989
6. Step 6: Final answer
   x = 1,223,672.99