Finding the Fourth Proportional to 11,911.89, 17,878.55 and 6,369.98

Step by Step Solution

1. Step 1: Write the proportion equation
   11,911.89 : 17,878.55 = 6,369.98 : x
2. Step 2: Convert to fraction form
   11,911.89/17,878.55 = 6,369.98/x
3. Step 3: Cross multiply
   11,911.89x = 17,878.55 × 6,369.98
4. Step 4: Simplify right side
   11,911.89x = 113,885,884.69
5. Step 5: Solve for x
   x = 113,885,884.69/11,911.89
6. Step 6: Final answer
   x = 9,560.69