Finding the Fourth Proportional to 9,918.72, 13,686.86 and 5,939.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.72 : 13,686.86 = 5,939.75 : x
2. Step 2: Convert to fraction form
   9,918.72/13,686.86 = 5,939.75/x
3. Step 3: Cross multiply
   9,918.72x = 13,686.86 × 5,939.75
4. Step 4: Simplify right side
   9,918.72x = 81,296,575.75
5. Step 5: Solve for x
   x = 81,296,575.75/9,918.72
6. Step 6: Final answer
   x = 8,196.28