Finding the Fourth Proportional to 7,166.72, 9,889.89 and 3,979.94

Step by Step Solution

1. Step 1: Write the proportion equation
   7,166.72 : 9,889.89 = 3,979.94 : x
2. Step 2: Convert to fraction form
   7,166.72/9,889.89 = 3,979.94/x
3. Step 3: Cross multiply
   7,166.72x = 9,889.89 × 3,979.94
4. Step 4: Simplify right side
   7,166.72x = 39,361,099.46
5. Step 5: Solve for x
   x = 39,361,099.46/7,166.72
6. Step 6: Final answer
   x = 5,492.21