Finding the Fourth Proportional to 10,890.63, 15,049.50 and 8,900.46

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.63 : 15,049.50 = 8,900.46 : x
2. Step 2: Convert to fraction form
   10,890.63/15,049.50 = 8,900.46/x
3. Step 3: Cross multiply
   10,890.63x = 15,049.50 × 8,900.46
4. Step 4: Simplify right side
   10,890.63x = 133,947,472.77
5. Step 5: Solve for x
   x = 133,947,472.77/10,890.63
6. Step 6: Final answer
   x = 12,299.33