Finding the Fourth Proportional to 8,736.57, 12,056.69 and 4,959.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,736.57 : 12,056.69 = 4,959.90 : x
2. Step 2: Convert to fraction form
   8,736.57/12,056.69 = 4,959.90/x
3. Step 3: Cross multiply
   8,736.57x = 12,056.69 × 4,959.90
4. Step 4: Simplify right side
   8,736.57x = 59,799,951.93
5. Step 5: Solve for x
   x = 59,799,951.93/8,736.57
6. Step 6: Final answer
   x = 6,844.79