Finding the Fourth Proportional to 5,591.80, 8,390.72 and 2,669.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,591.80 : 8,390.72 = 2,669.72 : x
2. Step 2: Convert to fraction form
   5,591.80/8,390.72 = 2,669.72/x
3. Step 3: Cross multiply
   5,591.80x = 8,390.72 × 2,669.72
4. Step 4: Simplify right side
   5,591.80x = 22,400,873.00
5. Step 5: Solve for x
   x = 22,400,873.00/5,591.80
6. Step 6: Final answer
   x = 4,006.02