Finding the Fourth Proportional to 21,815.46, 30,106.89 and 12,384.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,815.46 : 30,106.89 = 12,384.63 : x
2. Step 2: Convert to fraction form
   21,815.46/30,106.89 = 12,384.63/x
3. Step 3: Cross multiply
   21,815.46x = 30,106.89 × 12,384.63
4. Step 4: Simplify right side
   21,815.46x = 372,862,693.10
5. Step 5: Solve for x
   x = 372,862,693.10/21,815.46
6. Step 6: Final answer
   x = 17,091.67