Finding the Fourth Proportional to 9,321.74, 13,989.59 and 5,816.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.74 : 13,989.59 = 5,816.87 : x
2. Step 2: Convert to fraction form
   9,321.74/13,989.59 = 5,816.87/x
3. Step 3: Cross multiply
   9,321.74x = 13,989.59 × 5,816.87
4. Step 4: Simplify right side
   9,321.74x = 81,375,626.38
5. Step 5: Solve for x
   x = 81,375,626.38/9,321.74
6. Step 6: Final answer
   x = 8,729.66