Finding the Fourth Proportional to 8,680.10, 11,978.82 and 4,904.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,680.10 : 11,978.82 = 4,904.21 : x
2. Step 2: Convert to fraction form
   8,680.10/11,978.82 = 4,904.21/x
3. Step 3: Cross multiply
   8,680.10x = 11,978.82 × 4,904.21
4. Step 4: Simplify right side
   8,680.10x = 58,746,678.78
5. Step 5: Solve for x
   x = 58,746,678.78/8,680.10
6. Step 6: Final answer
   x = 6,767.98