Finding the Fourth Proportional to 9,290.85, 12,811.59 and 7,166.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.85 : 12,811.59 = 7,166.72 : x
2. Step 2: Convert to fraction form
   9,290.85/12,811.59 = 7,166.72/x
3. Step 3: Cross multiply
   9,290.85x = 12,811.59 × 7,166.72
4. Step 4: Simplify right side
   9,290.85x = 91,817,078.28
5. Step 5: Solve for x
   x = 91,817,078.28/9,290.85
6. Step 6: Final answer
   x = 9,882.53