Finding the Fourth Proportional to 11,380.72, 17,078.82 and 3,985.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,380.72 : 17,078.82 = 3,985.12 : x
2. Step 2: Convert to fraction form
   11,380.72/17,078.82 = 3,985.12/x
3. Step 3: Cross multiply
   11,380.72x = 17,078.82 × 3,985.12
4. Step 4: Simplify right side
   11,380.72x = 68,061,147.16
5. Step 5: Solve for x
   x = 68,061,147.16/11,380.72
6. Step 6: Final answer
   x = 5,980.39