Finding the Fourth Proportional to 9,178.27, 12,666.17 and 5,199.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,178.27 : 12,666.17 = 5,199.37 : x
2. Step 2: Convert to fraction form
   9,178.27/12,666.17 = 5,199.37/x
3. Step 3: Cross multiply
   9,178.27x = 12,666.17 × 5,199.37
4. Step 4: Simplify right side
   9,178.27x = 65,856,085.65
5. Step 5: Solve for x
   x = 65,856,085.65/9,178.27
6. Step 6: Final answer
   x = 7,175.22