Finding the Fourth Proportional to 10,990.56, 16,484.01 and 3,969.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,990.56 : 16,484.01 = 3,969.21 : x
2. Step 2: Convert to fraction form
   10,990.56/16,484.01 = 3,969.21/x
3. Step 3: Cross multiply
   10,990.56x = 16,484.01 × 3,969.21
4. Step 4: Simplify right side
   10,990.56x = 65,428,497.33
5. Step 5: Solve for x
   x = 65,428,497.33/10,990.56
6. Step 6: Final answer
   x = 5,953.15