Finding the Third Proportional to 620,904 and 910,909.50

Step by Step Solution

1. Step 1: Write the proportion equation
   620,904 : 910,909.50 = 910,909.50 : x
2. Step 2: Convert to fraction form
   620,904/910,909.50 = 910,909.50/x
3. Step 3: Cross multiply
   620,904x = 910,909.50 × 910,909.50
4. Step 4: Simplify right side
   620,904x = 829,756,117,190.25
5. Step 5: Solve for x
   x = 829,756,117,190.25/620,904
6. Step 6: Final answer
   x = 1,336,367.81