Finding the Fourth Proportional to 5,579.76, 7,692.72 and 4,005.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,579.76 : 7,692.72 = 4,005.12 : x
2. Step 2: Convert to fraction form
   5,579.76/7,692.72 = 4,005.12/x
3. Step 3: Cross multiply
   5,579.76x = 7,692.72 × 4,005.12
4. Step 4: Simplify right side
   5,579.76x = 30,810,266.73
5. Step 5: Solve for x
   x = 30,810,266.73/5,579.76
6. Step 6: Final answer
   x = 5,521.79