Finding the Fourth Proportional to 9,855.05, 13,599.50 and 5,378.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,855.05 : 13,599.50 = 5,378.69 : x
2. Step 2: Convert to fraction form
   9,855.05/13,599.50 = 5,378.69/x
3. Step 3: Cross multiply
   9,855.05x = 13,599.50 × 5,378.69
4. Step 4: Simplify right side
   9,855.05x = 73,147,482.64
5. Step 5: Solve for x
   x = 73,147,482.64/9,855.05
6. Step 6: Final answer
   x = 7,422.33