Finding the Fourth Proportional to 20,887.18, 31,345.83 and 8,238.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,887.18 : 31,345.83 = 8,238.82 : x
2. Step 2: Convert to fraction form
   20,887.18/31,345.83 = 8,238.82/x
3. Step 3: Cross multiply
   20,887.18x = 31,345.83 × 8,238.82
4. Step 4: Simplify right side
   20,887.18x = 258,252,651.12
5. Step 5: Solve for x
   x = 258,252,651.12/20,887.18
6. Step 6: Final answer
   x = 12,364.17