Finding the Fourth Proportional to 10,999.69, 16,499.08 and 3,979.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,999.69 : 16,499.08 = 3,979.87 : x
2. Step 2: Convert to fraction form
   10,999.69/16,499.08 = 3,979.87/x
3. Step 3: Cross multiply
   10,999.69x = 16,499.08 × 3,979.87
4. Step 4: Simplify right side
   10,999.69x = 65,664,157.25
5. Step 5: Solve for x
   x = 65,664,157.25/10,999.69
6. Step 6: Final answer
   x = 5,969.64