Finding the Fourth Proportional to 11,870.20, 16,390.92 and 8,880.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.20 : 16,390.92 = 8,880.76 : x
2. Step 2: Convert to fraction form
   11,870.20/16,390.92 = 8,880.76/x
3. Step 3: Cross multiply
   11,870.20x = 16,390.92 × 8,880.76
4. Step 4: Simplify right side
   11,870.20x = 145,563,826.70
5. Step 5: Solve for x
   x = 145,563,826.70/11,870.20
6. Step 6: Final answer
   x = 12,262.96