Finding the Fourth Proportional to 21,860.08, 30,166.64 and 12,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,860.08 : 30,166.64 = 12,426.72 : x
2. Step 2: Convert to fraction form
   21,860.08/30,166.64 = 12,426.72/x
3. Step 3: Cross multiply
   21,860.08x = 30,166.64 × 12,426.72
4. Step 4: Simplify right side
   21,860.08x = 374,872,388.62
5. Step 5: Solve for x
   x = 374,872,388.62/21,860.08
6. Step 6: Final answer
   x = 17,148.72