Finding the Fourth Proportional to 9,919.35, 13,688.67 and 5,443.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.35 : 13,688.67 = 5,443.18 : x
2. Step 2: Convert to fraction form
   9,919.35/13,688.67 = 5,443.18/x
3. Step 3: Cross multiply
   9,919.35x = 13,688.67 × 5,443.18
4. Step 4: Simplify right side
   9,919.35x = 74,509,904.15
5. Step 5: Solve for x
   x = 74,509,904.15/9,919.35
6. Step 6: Final answer
   x = 7,511.57