Finding the Fourth Proportional to 9,955.81, 13,738.78 and 5,479.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,955.81 : 13,738.78 = 5,479.55 : x
2. Step 2: Convert to fraction form
   9,955.81/13,738.78 = 5,479.55/x
3. Step 3: Cross multiply
   9,955.81x = 13,738.78 × 5,479.55
4. Step 4: Simplify right side
   9,955.81x = 75,282,321.62
5. Step 5: Solve for x
   x = 75,282,321.62/9,955.81
6. Step 6: Final answer
   x = 7,561.65