Finding the Third Proportional to 3,873.38 and 8,390.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,873.38 : 8,390.63 = 8,390.63 : x
2. Step 2: Convert to fraction form
   3,873.38/8,390.63 = 8,390.63/x
3. Step 3: Cross multiply
   3,873.38x = 8,390.63 × 8,390.63
4. Step 4: Simplify right side
   3,873.38x = 70,402,587.89
5. Step 5: Solve for x
   x = 70,402,587.89/3,873.38
6. Step 6: Final answer
   x = 18,176.03