Finding the Fourth Proportional to 9,290.06, 12,821.42 and 5,311.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.06 : 12,821.42 = 5,311.56 : x
2. Step 2: Convert to fraction form
   9,290.06/12,821.42 = 5,311.56/x
3. Step 3: Cross multiply
   9,290.06x = 12,821.42 × 5,311.56
4. Step 4: Simplify right side
   9,290.06x = 68,101,741.62
5. Step 5: Solve for x
   x = 68,101,741.62/9,290.06
6. Step 6: Final answer
   x = 7,330.60