Finding the Fourth Proportional to 8,700.82, 12,012.33 and 5,721.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,700.82 : 12,012.33 = 5,721.64 : x
2. Step 2: Convert to fraction form
   8,700.82/12,012.33 = 5,721.64/x
3. Step 3: Cross multiply
   8,700.82x = 12,012.33 × 5,721.64
4. Step 4: Simplify right side
   8,700.82x = 68,730,227.82
5. Step 5: Solve for x
   x = 68,730,227.82/8,700.82
6. Step 6: Final answer
   x = 7,899.28