Finding the Fourth Proportional to 9,820.89, 13,551.80 and 5,571.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,820.89 : 13,551.80 = 5,571.09 : x
2. Step 2: Convert to fraction form
   9,820.89/13,551.80 = 5,571.09/x
3. Step 3: Cross multiply
   9,820.89x = 13,551.80 × 5,571.09
4. Step 4: Simplify right side
   9,820.89x = 75,498,269.61
5. Step 5: Solve for x
   x = 75,498,269.61/9,820.89
6. Step 6: Final answer
   x = 7,687.52