Finding the Third Proportional to 8,429.63 and 12,143.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.63 : 12,143.25 = 12,143.25 : x
2. Step 2: Convert to fraction form
   8,429.63/12,143.25 = 12,143.25/x
3. Step 3: Cross multiply
   8,429.63x = 12,143.25 × 12,143.25
4. Step 4: Simplify right side
   8,429.63x = 147,458,520.56
5. Step 5: Solve for x
   x = 147,458,520.56/8,429.63
6. Step 6: Final answer
   x = 17,492.89