Finding the Fourth Proportional to 21,981.34, 30,336.42 and 12,551.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,981.34 : 30,336.42 = 12,551.32 : x
2. Step 2: Convert to fraction form
   21,981.34/30,336.42 = 12,551.32/x
3. Step 3: Cross multiply
   21,981.34x = 30,336.42 × 12,551.32
4. Step 4: Simplify right side
   21,981.34x = 380,762,115.07
5. Step 5: Solve for x
   x = 380,762,115.07/21,981.34
6. Step 6: Final answer
   x = 17,322.06