Finding the Fourth Proportional to 8,443.56, 12,665.32 and 7,929.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,443.56 : 12,665.32 = 7,929.76 : x
2. Step 2: Convert to fraction form
   8,443.56/12,665.32 = 7,929.76/x
3. Step 3: Cross multiply
   8,443.56x = 12,665.32 × 7,929.76
4. Step 4: Simplify right side
   8,443.56x = 100,432,955.80
5. Step 5: Solve for x
   x = 100,432,955.80/8,443.56
6. Step 6: Final answer
   x = 11,894.62