Finding the Fourth Proportional to 9,997.79, 13,797.59 and 5,521.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,997.79 : 13,797.59 = 5,521.55 : x
2. Step 2: Convert to fraction form
   9,997.79/13,797.59 = 5,521.55/x
3. Step 3: Cross multiply
   9,997.79x = 13,797.59 × 5,521.55
4. Step 4: Simplify right side
   9,997.79x = 76,183,986.47
5. Step 5: Solve for x
   x = 76,183,986.47/9,997.79
6. Step 6: Final answer
   x = 7,620.09