Finding the Third Proportional to 713,839 and 978,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   713,839 : 978,808.50 = 978,808.50 : x
2. Step 2: Convert to fraction form
   713,839/978,808.50 = 978,808.50/x
3. Step 3: Cross multiply
   713,839x = 978,808.50 × 978,808.50
4. Step 4: Simplify right side
   713,839x = 958,066,079,672.25
5. Step 5: Solve for x
   x = 958,066,079,672.25/713,839
6. Step 6: Final answer
   x = 1,342,131.88