Finding the Fourth Proportional to 21,931.27, 30,265.47 and 12,371.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,931.27 : 30,265.47 = 12,371.61 : x
2. Step 2: Convert to fraction form
   21,931.27/30,265.47 = 12,371.61/x
3. Step 3: Cross multiply
   21,931.27x = 30,265.47 × 12,371.61
4. Step 4: Simplify right side
   21,931.27x = 374,432,591.31
5. Step 5: Solve for x
   x = 374,432,591.31/21,931.27
6. Step 6: Final answer
   x = 17,073.00