Finding the Fourth Proportional to 21,908.60, 30,237 and 12,478.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,908.60 : 30,237 = 12,478.04 : x
2. Step 2: Convert to fraction form
   21,908.60/30,237 = 12,478.04/x
3. Step 3: Cross multiply
   21,908.60x = 30,237 × 12,478.04
4. Step 4: Simplify right side
   21,908.60x = 377,298,495.48
5. Step 5: Solve for x
   x = 377,298,495.48/21,908.60
6. Step 6: Final answer
   x = 17,221.48