Finding the Fourth Proportional to 9,899.42, 13,662.96 and 5,920.97

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.42 : 13,662.96 = 5,920.97 : x
2. Step 2: Convert to fraction form
   9,899.42/13,662.96 = 5,920.97/x
3. Step 3: Cross multiply
   9,899.42x = 13,662.96 × 5,920.97
4. Step 4: Simplify right side
   9,899.42x = 80,897,976.27
5. Step 5: Solve for x
   x = 80,897,976.27/9,899.42
6. Step 6: Final answer
   x = 8,171.99