Finding the Fourth Proportional to 7,160.72, 9,886.61 and 5,479.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,160.72 : 9,886.61 = 5,479.12 : x
2. Step 2: Convert to fraction form
   7,160.72/9,886.61 = 5,479.12/x
3. Step 3: Cross multiply
   7,160.72x = 9,886.61 × 5,479.12
4. Step 4: Simplify right side
   7,160.72x = 54,169,890.01
5. Step 5: Solve for x
   x = 54,169,890.01/7,160.72
6. Step 6: Final answer
   x = 7,564.87