Finding the Fourth Proportional to 21,877.32, 30,188.90 and 12,443.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,877.32 : 30,188.90 = 12,443.56 : x
2. Step 2: Convert to fraction form
   21,877.32/30,188.90 = 12,443.56/x
3. Step 3: Cross multiply
   21,877.32x = 30,188.90 × 12,443.56
4. Step 4: Simplify right side
   21,877.32x = 375,657,388.48
5. Step 5: Solve for x
   x = 375,657,388.48/21,877.32
6. Step 6: Final answer
   x = 17,171.09