Finding the Fourth Proportional to 2,662.20, 3,989.52 and 1,197.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.20 : 3,989.52 = 1,197.72 : x
2. Step 2: Convert to fraction form
   2,662.20/3,989.52 = 1,197.72/x
3. Step 3: Cross multiply
   2,662.20x = 3,989.52 × 1,197.72
4. Step 4: Simplify right side
   2,662.20x = 4,778,327.89
5. Step 5: Solve for x
   x = 4,778,327.89/2,662.20
6. Step 6: Final answer
   x = 1,794.88