Finding the Fourth Proportional to 9,920.42, 13,689.92 and 5,444.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.42 : 13,689.92 = 5,444.12 : x
2. Step 2: Convert to fraction form
   9,920.42/13,689.92 = 5,444.12/x
3. Step 3: Cross multiply
   9,920.42x = 13,689.92 × 5,444.12
4. Step 4: Simplify right side
   9,920.42x = 74,529,567.27
5. Step 5: Solve for x
   x = 74,529,567.27/9,920.42
6. Step 6: Final answer
   x = 7,512.74