Finding the Fourth Proportional to 8,617.94, 11,892.15 and 4,789.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,617.94 : 11,892.15 = 4,789.78 : x
2. Step 2: Convert to fraction form
   8,617.94/11,892.15 = 4,789.78/x
3. Step 3: Cross multiply
   8,617.94x = 11,892.15 × 4,789.78
4. Step 4: Simplify right side
   8,617.94x = 56,960,752.50
5. Step 5: Solve for x
   x = 56,960,752.50/8,617.94
6. Step 6: Final answer
   x = 6,609.56