Finding the Fourth Proportional to 8,640.72, 12,950.57 and 4,682.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,640.72 : 12,950.57 = 4,682.59 : x
2. Step 2: Convert to fraction form
   8,640.72/12,950.57 = 4,682.59/x
3. Step 3: Cross multiply
   8,640.72x = 12,950.57 × 4,682.59
4. Step 4: Simplify right side
   8,640.72x = 60,642,227.85
5. Step 5: Solve for x
   x = 60,642,227.85/8,640.72
6. Step 6: Final answer
   x = 7,018.19