Finding the Fourth Proportional to 9,918.86, 13,688.43 and 5,939.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.86 : 13,688.43 = 5,939.18 : x
2. Step 2: Convert to fraction form
   9,918.86/13,688.43 = 5,939.18/x
3. Step 3: Cross multiply
   9,918.86x = 13,688.43 × 5,939.18
4. Step 4: Simplify right side
   9,918.86x = 81,298,049.69
5. Step 5: Solve for x
   x = 81,298,049.69/9,918.86
6. Step 6: Final answer
   x = 8,196.31