Finding the Fourth Proportional to 9,291.51, 12,821.49 and 5,311.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,291.51 : 12,821.49 = 5,311.98 : x
2. Step 2: Convert to fraction form
   9,291.51/12,821.49 = 5,311.98/x
3. Step 3: Cross multiply
   9,291.51x = 12,821.49 × 5,311.98
4. Step 4: Simplify right side
   9,291.51x = 68,107,498.45
5. Step 5: Solve for x
   x = 68,107,498.45/9,291.51
6. Step 6: Final answer
   x = 7,330.08