Finding the Fourth Proportional to 11,885.83, 17,832.69 and 3,989.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,885.83 : 17,832.69 = 3,989.12 : x
2. Step 2: Convert to fraction form
   11,885.83/17,832.69 = 3,989.12/x
3. Step 3: Cross multiply
   11,885.83x = 17,832.69 × 3,989.12
4. Step 4: Simplify right side
   11,885.83x = 71,136,651.17
5. Step 5: Solve for x
   x = 71,136,651.17/11,885.83
6. Step 6: Final answer
   x = 5,985.00