Finding the Third Proportional to 407,152.20 and 804,086.05

Step by Step Solution

1. Step 1: Write the proportion equation
   407,152.20 : 804,086.05 = 804,086.05 : x
2. Step 2: Convert to fraction form
   407,152.20/804,086.05 = 804,086.05/x
3. Step 3: Cross multiply
   407,152.20x = 804,086.05 × 804,086.05
4. Step 4: Simplify right side
   407,152.20x = 646,554,377,060.99
5. Step 5: Solve for x
   x = 646,554,377,060.99/407,152.20
6. Step 6: Final answer
   x = 1,587,991.87