Finding the Third Proportional to 3,929.77 and 8,423.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,929.77 : 8,423.37 = 8,423.37 : x
2. Step 2: Convert to fraction form
   3,929.77/8,423.37 = 8,423.37/x
3. Step 3: Cross multiply
   3,929.77x = 8,423.37 × 8,423.37
4. Step 4: Simplify right side
   3,929.77x = 70,953,114.78
5. Step 5: Solve for x
   x = 70,953,114.78/3,929.77
6. Step 6: Final answer
   x = 18,055.30