Finding the Third Proportional to 540,726.50 and 815,231

Step by Step Solution

1. Step 1: Write the proportion equation
   540,726.50 : 815,231 = 815,231 : x
2. Step 2: Convert to fraction form
   540,726.50/815,231 = 815,231/x
3. Step 3: Cross multiply
   540,726.50x = 815,231 × 815,231
4. Step 4: Simplify right side
   540,726.50x = 664,601,583,361
5. Step 5: Solve for x
   x = 664,601,583,361/540,726.50
6. Step 6: Final answer
   x = 1,229,090.09