Finding the Third Proportional to 138,209.25 and 301,431

Step by Step Solution

1. Step 1: Write the proportion equation
   138,209.25 : 301,431 = 301,431 : x
2. Step 2: Convert to fraction form
   138,209.25/301,431 = 301,431/x
3. Step 3: Cross multiply
   138,209.25x = 301,431 × 301,431
4. Step 4: Simplify right side
   138,209.25x = 90,860,647,761
5. Step 5: Solve for x
   x = 90,860,647,761/138,209.25
6. Step 6: Final answer
   x = 657,413.65