Finding the Fourth Proportional to 7,099.88, 10,649.78 and 3,979.90

Step by Step Solution

1. Step 1: Write the proportion equation
   7,099.88 : 10,649.78 = 3,979.90 : x
2. Step 2: Convert to fraction form
   7,099.88/10,649.78 = 3,979.90/x
3. Step 3: Cross multiply
   7,099.88x = 10,649.78 × 3,979.90
4. Step 4: Simplify right side
   7,099.88x = 42,385,059.42
5. Step 5: Solve for x
   x = 42,385,059.42/7,099.88
6. Step 6: Final answer
   x = 5,969.83