Finding the Fourth Proportional to 21,875.42, 30,187.81 and 12,443.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,875.42 : 30,187.81 = 12,443.96 : x
2. Step 2: Convert to fraction form
   21,875.42/30,187.81 = 12,443.96/x
3. Step 3: Cross multiply
   21,875.42x = 30,187.81 × 12,443.96
4. Step 4: Simplify right side
   21,875.42x = 375,655,900.13
5. Step 5: Solve for x
   x = 375,655,900.13/21,875.42
6. Step 6: Final answer
   x = 17,172.51