Finding the Third Proportional to 503,619 and 780,958.50

Step by Step Solution

1. Step 1: Write the proportion equation
   503,619 : 780,958.50 = 780,958.50 : x
2. Step 2: Convert to fraction form
   503,619/780,958.50 = 780,958.50/x
3. Step 3: Cross multiply
   503,619x = 780,958.50 × 780,958.50
4. Step 4: Simplify right side
   503,619x = 609,896,178,722.25
5. Step 5: Solve for x
   x = 609,896,178,722.25/503,619
6. Step 6: Final answer
   x = 1,211,026.94