Finding the Fourth Proportional to 11,385.34, 17,077.48 and 3,991.47

Step by Step Solution

1. Step 1: Write the proportion equation
   11,385.34 : 17,077.48 = 3,991.47 : x
2. Step 2: Convert to fraction form
   11,385.34/17,077.48 = 3,991.47/x
3. Step 3: Cross multiply
   11,385.34x = 17,077.48 × 3,991.47
4. Step 4: Simplify right side
   11,385.34x = 68,164,249.10
5. Step 5: Solve for x
   x = 68,164,249.10/11,385.34
6. Step 6: Final answer
   x = 5,987.02