Finding the Fourth Proportional to 8,401.35, 12,589.71 and 7,478.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,401.35 : 12,589.71 = 7,478.76 : x
2. Step 2: Convert to fraction form
   8,401.35/12,589.71 = 7,478.76/x
3. Step 3: Cross multiply
   8,401.35x = 12,589.71 × 7,478.76
4. Step 4: Simplify right side
   8,401.35x = 94,155,419.56
5. Step 5: Solve for x
   x = 94,155,419.56/8,401.35
6. Step 6: Final answer
   x = 11,207.18