Finding the Fourth Proportional to 9,290.37, 12,821.58 and 5,310.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290.37 : 12,821.58 = 5,310.71 : x
2. Step 2: Convert to fraction form
   9,290.37/12,821.58 = 5,310.71/x
3. Step 3: Cross multiply
   9,290.37x = 12,821.58 × 5,310.71
4. Step 4: Simplify right side
   9,290.37x = 68,091,693.12
5. Step 5: Solve for x
   x = 68,091,693.12/9,290.37
6. Step 6: Final answer
   x = 7,329.28