Finding the Fourth Proportional to 21,978.71, 30,336.05 and 12,552.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.71 : 30,336.05 = 12,552.74 : x
2. Step 2: Convert to fraction form
   21,978.71/30,336.05 = 12,552.74/x
3. Step 3: Cross multiply
   21,978.71x = 30,336.05 × 12,552.74
4. Step 4: Simplify right side
   21,978.71x = 380,800,548.28
5. Step 5: Solve for x
   x = 380,800,548.28/21,978.71
6. Step 6: Final answer
   x = 17,325.88