Finding the Fourth Proportional to 8,401.32, 12,582.54 and 8,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,401.32 : 12,582.54 = 8,109.72 : x
2. Step 2: Convert to fraction form
   8,401.32/12,582.54 = 8,109.72/x
3. Step 3: Cross multiply
   8,401.32x = 12,582.54 × 8,109.72
4. Step 4: Simplify right side
   8,401.32x = 102,040,876.29
5. Step 5: Solve for x
   x = 102,040,876.29/8,401.32
6. Step 6: Final answer
   x = 12,145.81