Finding the Third Proportional to 8,431.75 and 13,113.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,431.75 : 13,113.50 = 13,113.50 : x
2. Step 2: Convert to fraction form
   8,431.75/13,113.50 = 13,113.50/x
3. Step 3: Cross multiply
   8,431.75x = 13,113.50 × 13,113.50
4. Step 4: Simplify right side
   8,431.75x = 171,963,882.25
5. Step 5: Solve for x
   x = 171,963,882.25/8,431.75
6. Step 6: Final answer
   x = 20,394.80