Finding the Third Proportional to 286,578 and 622,909.50

Step by Step Solution

1. Step 1: Write the proportion equation
   286,578 : 622,909.50 = 622,909.50 : x
2. Step 2: Convert to fraction form
   286,578/622,909.50 = 622,909.50/x
3. Step 3: Cross multiply
   286,578x = 622,909.50 × 622,909.50
4. Step 4: Simplify right side
   286,578x = 388,016,245,190.25
5. Step 5: Solve for x
   x = 388,016,245,190.25/286,578
6. Step 6: Final answer
   x = 1,353,963.83