Finding the Fourth Proportional to 9,890.73, 13,650.81 and 5,641.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.73 : 13,650.81 = 5,641.89 : x
2. Step 2: Convert to fraction form
   9,890.73/13,650.81 = 5,641.89/x
3. Step 3: Cross multiply
   9,890.73x = 13,650.81 × 5,641.89
4. Step 4: Simplify right side
   9,890.73x = 77,016,368.43
5. Step 5: Solve for x
   x = 77,016,368.43/9,890.73
6. Step 6: Final answer
   x = 7,786.72