Finding the Fourth Proportional to 9,920.98, 13,691.12 and 5,445.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.98 : 13,691.12 = 5,445.15 : x
2. Step 2: Convert to fraction form
   9,920.98/13,691.12 = 5,445.15/x
3. Step 3: Cross multiply
   9,920.98x = 13,691.12 × 5,445.15
4. Step 4: Simplify right side
   9,920.98x = 74,550,143.92
5. Step 5: Solve for x
   x = 74,550,143.92/9,920.98
6. Step 6: Final answer
   x = 7,514.39