Finding the Fourth Proportional to 9,956.78, 13,739.55 and 5,479.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,956.78 : 13,739.55 = 5,479.82 : x
2. Step 2: Convert to fraction form
   9,956.78/13,739.55 = 5,479.82/x
3. Step 3: Cross multiply
   9,956.78x = 13,739.55 × 5,479.82
4. Step 4: Simplify right side
   9,956.78x = 75,290,260.88
5. Step 5: Solve for x
   x = 75,290,260.88/9,956.78
6. Step 6: Final answer
   x = 7,561.71