Finding the Third Proportional to 525,222 and 811,123

Step by Step Solution

1. Step 1: Write the proportion equation
   525,222 : 811,123 = 811,123 : x
2. Step 2: Convert to fraction form
   525,222/811,123 = 811,123/x
3. Step 3: Cross multiply
   525,222x = 811,123 × 811,123
4. Step 4: Simplify right side
   525,222x = 657,920,521,129
5. Step 5: Solve for x
   x = 657,920,521,129/525,222
6. Step 6: Final answer
   x = 1,252,652.25