Finding the Fourth Proportional to 9,920.16, 13,689.70 and 5,443.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.16 : 13,689.70 = 5,443.69 : x
2. Step 2: Convert to fraction form
   9,920.16/13,689.70 = 5,443.69/x
3. Step 3: Cross multiply
   9,920.16x = 13,689.70 × 5,443.69
4. Step 4: Simplify right side
   9,920.16x = 74,522,482.99
5. Step 5: Solve for x
   x = 74,522,482.99/9,920.16
6. Step 6: Final answer
   x = 7,512.23