Finding the Fourth Proportional to 11,991.62, 17,976.47 and 4,196.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,991.62 : 17,976.47 = 4,196.18 : x
2. Step 2: Convert to fraction form
   11,991.62/17,976.47 = 4,196.18/x
3. Step 3: Cross multiply
   11,991.62x = 17,976.47 × 4,196.18
4. Step 4: Simplify right side
   11,991.62x = 75,432,393.02
5. Step 5: Solve for x
   x = 75,432,393.02/11,991.62
6. Step 6: Final answer
   x = 6,290.43