Finding the Third Proportional to 808,400 and 1,268,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   808,400 : 1,268,139.50 = 1,268,139.50 : x
2. Step 2: Convert to fraction form
   808,400/1,268,139.50 = 1,268,139.50/x
3. Step 3: Cross multiply
   808,400x = 1,268,139.50 × 1,268,139.50
4. Step 4: Simplify right side
   808,400x = 1,608,177,791,460.25
5. Step 5: Solve for x
   x = 1,608,177,791,460.25/808,400
6. Step 6: Final answer
   x = 1,989,334.23