Finding the Fourth Proportional to 8,700.28, 12,016.35 and 5,729.39

Step by Step Solution

1. Step 1: Write the proportion equation
   8,700.28 : 12,016.35 = 5,729.39 : x
2. Step 2: Convert to fraction form
   8,700.28/12,016.35 = 5,729.39/x
3. Step 3: Cross multiply
   8,700.28x = 12,016.35 × 5,729.39
4. Step 4: Simplify right side
   8,700.28x = 68,846,355.53
5. Step 5: Solve for x
   x = 68,846,355.53/8,700.28
6. Step 6: Final answer
   x = 7,913.12