Finding the Fourth Proportional to 8,662.84, 12,983.96 and 3,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,662.84 : 12,983.96 = 3,978.88 : x
2. Step 2: Convert to fraction form
   8,662.84/12,983.96 = 3,978.88/x
3. Step 3: Cross multiply
   8,662.84x = 12,983.96 × 3,978.88
4. Step 4: Simplify right side
   8,662.84x = 51,661,596.25
5. Step 5: Solve for x
   x = 51,661,596.25/8,662.84
6. Step 6: Final answer
   x = 5,963.59