Finding the Third Proportional to 622,431 and 988,078.50

Step by Step Solution

1. Step 1: Write the proportion equation
   622,431 : 988,078.50 = 988,078.50 : x
2. Step 2: Convert to fraction form
   622,431/988,078.50 = 988,078.50/x
3. Step 3: Cross multiply
   622,431x = 988,078.50 × 988,078.50
4. Step 4: Simplify right side
   622,431x = 976,299,122,162.25
5. Step 5: Solve for x
   x = 976,299,122,162.25/622,431
6. Step 6: Final answer
   x = 1,568,525.86