Finding the Fourth Proportional to 8,990.71, 12,401.39 and 5,965.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.71 : 12,401.39 = 5,965.76 : x
2. Step 2: Convert to fraction form
   8,990.71/12,401.39 = 5,965.76/x
3. Step 3: Cross multiply
   8,990.71x = 12,401.39 × 5,965.76
4. Step 4: Simplify right side
   8,990.71x = 73,983,728.77
5. Step 5: Solve for x
   x = 73,983,728.77/8,990.71
6. Step 6: Final answer
   x = 8,228.91