Finding the Fourth Proportional to 11,987.82, 17,989.74 and 4,196.63

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.82 : 17,989.74 = 4,196.63 : x
2. Step 2: Convert to fraction form
   11,987.82/17,989.74 = 4,196.63/x
3. Step 3: Cross multiply
   11,987.82x = 17,989.74 × 4,196.63
4. Step 4: Simplify right side
   11,987.82x = 75,496,327.55
5. Step 5: Solve for x
   x = 75,496,327.55/11,987.82
6. Step 6: Final answer
   x = 6,297.75