Finding the Fourth Proportional to 9,918.05, 13,686.89 and 5,441.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.05 : 13,686.89 = 5,441.87 : x
2. Step 2: Convert to fraction form
   9,918.05/13,686.89 = 5,441.87/x
3. Step 3: Cross multiply
   9,918.05x = 13,686.89 × 5,441.87
4. Step 4: Simplify right side
   9,918.05x = 74,482,180.44
5. Step 5: Solve for x
   x = 74,482,180.44/9,918.05
6. Step 6: Final answer
   x = 7,509.76