Finding the Fourth Proportional to 9,890.34, 13,647.39 and 5,910.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.34 : 13,647.39 = 5,910.81 : x
2. Step 2: Convert to fraction form
   9,890.34/13,647.39 = 5,910.81/x
3. Step 3: Cross multiply
   9,890.34x = 13,647.39 × 5,910.81
4. Step 4: Simplify right side
   9,890.34x = 80,667,129.29
5. Step 5: Solve for x
   x = 80,667,129.29/9,890.34
6. Step 6: Final answer
   x = 8,156.15