Finding the Fourth Proportional to 7,230.72, 9,977.76 and 4,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,230.72 : 9,977.76 = 4,086.72 : x
2. Step 2: Convert to fraction form
   7,230.72/9,977.76 = 4,086.72/x
3. Step 3: Cross multiply
   7,230.72x = 9,977.76 × 4,086.72
4. Step 4: Simplify right side
   7,230.72x = 40,776,311.35
5. Step 5: Solve for x
   x = 40,776,311.35/7,230.72
6. Step 6: Final answer
   x = 5,639.32