Finding the Fourth Proportional to 9,955.88, 13,738.59 and 5,478.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,955.88 : 13,738.59 = 5,478.77 : x
2. Step 2: Convert to fraction form
   9,955.88/13,738.59 = 5,478.77/x
3. Step 3: Cross multiply
   9,955.88x = 13,738.59 × 5,478.77
4. Step 4: Simplify right side
   9,955.88x = 75,270,574.73
5. Step 5: Solve for x
   x = 75,270,574.73/9,955.88
6. Step 6: Final answer
   x = 7,560.41