Finding the Fourth Proportional to 12,238.12, 16,882.59 and 7,987.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.12 : 16,882.59 = 7,987.21 : x
2. Step 2: Convert to fraction form
   12,238.12/16,882.59 = 7,987.21/x
3. Step 3: Cross multiply
   12,238.12x = 16,882.59 × 7,987.21
4. Step 4: Simplify right side
   12,238.12x = 134,844,779.42
5. Step 5: Solve for x
   x = 134,844,779.42/12,238.12
6. Step 6: Final answer
   x = 11,018.42