Finding the Fourth Proportional to 9,855.76, 13,601.02 and 5,379.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,855.76 : 13,601.02 = 5,379.55 : x
2. Step 2: Convert to fraction form
   9,855.76/13,601.02 = 5,379.55/x
3. Step 3: Cross multiply
   9,855.76x = 13,601.02 × 5,379.55
4. Step 4: Simplify right side
   9,855.76x = 73,167,380.59
5. Step 5: Solve for x
   x = 73,167,380.59/9,855.76
6. Step 6: Final answer
   x = 7,423.82