Finding the Fourth Proportional to 6,389.27, 8,817.38 and 3,998.48

Step by Step Solution

1. Step 1: Write the proportion equation
   6,389.27 : 8,817.38 = 3,998.48 : x
2. Step 2: Convert to fraction form
   6,389.27/8,817.38 = 3,998.48/x
3. Step 3: Cross multiply
   6,389.27x = 8,817.38 × 3,998.48
4. Step 4: Simplify right side
   6,389.27x = 35,256,053.50
5. Step 5: Solve for x
   x = 35,256,053.50/6,389.27
6. Step 6: Final answer
   x = 5,518.01