Finding the Fourth Proportional to 9,955.78, 13,738.17 and 5,478.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,955.78 : 13,738.17 = 5,478.82 : x
2. Step 2: Convert to fraction form
   9,955.78/13,738.17 = 5,478.82/x
3. Step 3: Cross multiply
   9,955.78x = 13,738.17 × 5,478.82
4. Step 4: Simplify right side
   9,955.78x = 75,268,960.56
5. Step 5: Solve for x
   x = 75,268,960.56/9,955.78
6. Step 6: Final answer
   x = 7,560.33