Finding the Fourth Proportional to 21,141.17, 31,723.37 and 12,267.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,141.17 : 31,723.37 = 12,267.35 : x
2. Step 2: Convert to fraction form
   21,141.17/31,723.37 = 12,267.35/x
3. Step 3: Cross multiply
   21,141.17x = 31,723.37 × 12,267.35
4. Step 4: Simplify right side
   21,141.17x = 389,161,731.61
5. Step 5: Solve for x
   x = 389,161,731.61/21,141.17
6. Step 6: Final answer
   x = 18,407.76