Finding the Fourth Proportional to 9,955.95, 13,739.30 and 5,479.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,955.95 : 13,739.30 = 5,479.57 : x
2. Step 2: Convert to fraction form
   9,955.95/13,739.30 = 5,479.57/x
3. Step 3: Cross multiply
   9,955.95x = 13,739.30 × 5,479.57
4. Step 4: Simplify right side
   9,955.95x = 75,285,456.10
5. Step 5: Solve for x
   x = 75,285,456.10/9,955.95
6. Step 6: Final answer
   x = 7,561.86