Finding the Fourth Proportional to 21,916.17, 30,245.04 and 12,485.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,916.17 : 30,245.04 = 12,485.34 : x
2. Step 2: Convert to fraction form
   21,916.17/30,245.04 = 12,485.34/x
3. Step 3: Cross multiply
   21,916.17x = 30,245.04 × 12,485.34
4. Step 4: Simplify right side
   21,916.17x = 377,619,607.71
5. Step 5: Solve for x
   x = 377,619,607.71/21,916.17
6. Step 6: Final answer
   x = 17,230.18