Finding the Fourth Proportional to 21,242.83, 31,845.61 and 8,086.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,242.83 : 31,845.61 = 8,086.45 : x
2. Step 2: Convert to fraction form
   21,242.83/31,845.61 = 8,086.45/x
3. Step 3: Cross multiply
   21,242.83x = 31,845.61 × 8,086.45
4. Step 4: Simplify right side
   21,242.83x = 257,517,833.15
5. Step 5: Solve for x
   x = 257,517,833.15/21,242.83
6. Step 6: Final answer
   x = 12,122.58