Finding the Fourth Proportional to 8,680.84, 11,978.72 and 4,851.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,680.84 : 11,978.72 = 4,851.78 : x
2. Step 2: Convert to fraction form
   8,680.84/11,978.72 = 4,851.78/x
3. Step 3: Cross multiply
   8,680.84x = 11,978.72 × 4,851.78
4. Step 4: Simplify right side
   8,680.84x = 58,118,114.12
5. Step 5: Solve for x
   x = 58,118,114.12/8,680.84
6. Step 6: Final answer
   x = 6,694.99