Finding the Third Proportional to 521,190 and 777,231.75

Step by Step Solution

1. Step 1: Write the proportion equation
   521,190 : 777,231.75 = 777,231.75 : x
2. Step 2: Convert to fraction form
   521,190/777,231.75 = 777,231.75/x
3. Step 3: Cross multiply
   521,190x = 777,231.75 × 777,231.75
4. Step 4: Simplify right side
   521,190x = 604,089,193,208.06
5. Step 5: Solve for x
   x = 604,089,193,208.06/521,190
6. Step 6: Final answer
   x = 1,159,057.53