Finding the Fourth Proportional to 9,290.55, 12,821.82 and 5,310.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.55 : 12,821.82 = 5,310.87 : x
2. Step 2: Convert to fraction form
   9,290.55/12,821.82 = 5,310.87/x
3. Step 3: Cross multiply
   9,290.55x = 12,821.82 × 5,310.87
4. Step 4: Simplify right side
   9,290.55x = 68,095,019.18
5. Step 5: Solve for x
   x = 68,095,019.18/9,290.55
6. Step 6: Final answer
   x = 7,329.49