Finding the Fourth Proportional to 12,661.55, 18,990.56 and 3,300.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.55 : 18,990.56 = 3,300.81 : x
2. Step 2: Convert to fraction form
   12,661.55/18,990.56 = 3,300.81/x
3. Step 3: Cross multiply
   12,661.55x = 18,990.56 × 3,300.81
4. Step 4: Simplify right side
   12,661.55x = 62,684,213.85
5. Step 5: Solve for x
   x = 62,684,213.85/12,661.55
6. Step 6: Final answer
   x = 4,950.76