Finding the Fourth Proportional to 6,908.88, 10,353.59 and 5,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,908.88 : 10,353.59 = 5,178.72 : x
2. Step 2: Convert to fraction form
   6,908.88/10,353.59 = 5,178.72/x
3. Step 3: Cross multiply
   6,908.88x = 10,353.59 × 5,178.72
4. Step 4: Simplify right side
   6,908.88x = 53,618,317.71
5. Step 5: Solve for x
   x = 53,618,317.71/6,908.88
6. Step 6: Final answer
   x = 7,760.78