Finding the Fourth Proportional to 9,111.84, 12,571.60 and 5,571.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.84 : 12,571.60 = 5,571.32 : x
2. Step 2: Convert to fraction form
   9,111.84/12,571.60 = 5,571.32/x
3. Step 3: Cross multiply
   9,111.84x = 12,571.60 × 5,571.32
4. Step 4: Simplify right side
   9,111.84x = 70,040,406.51
5. Step 5: Solve for x
   x = 70,040,406.51/9,111.84
6. Step 6: Final answer
   x = 7,686.75