Finding the Fourth Proportional to 8,900.42, 13,353.06 and 2,660.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,900.42 : 13,353.06 = 2,660.72 : x
2. Step 2: Convert to fraction form
   8,900.42/13,353.06 = 2,660.72/x
3. Step 3: Cross multiply
   8,900.42x = 13,353.06 × 2,660.72
4. Step 4: Simplify right side
   8,900.42x = 35,528,753.80
5. Step 5: Solve for x
   x = 35,528,753.80/8,900.42
6. Step 6: Final answer
   x = 3,991.81