Finding the Fourth Proportional to 2,885.76, 3,981.12 and 1,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,885.76 : 3,981.12 = 1,890.72 : x
2. Step 2: Convert to fraction form
   2,885.76/3,981.12 = 1,890.72/x
3. Step 3: Cross multiply
   2,885.76x = 3,981.12 × 1,890.72
4. Step 4: Simplify right side
   2,885.76x = 7,527,183.21
5. Step 5: Solve for x
   x = 7,527,183.21/2,885.76
6. Step 6: Final answer
   x = 2,608.39