Finding the Fourth Proportional to 21,895.54, 30,205.02 and 12,938.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,895.54 : 30,205.02 = 12,938.71 : x
2. Step 2: Convert to fraction form
   21,895.54/30,205.02 = 12,938.71/x
3. Step 3: Cross multiply
   21,895.54x = 30,205.02 × 12,938.71
4. Step 4: Simplify right side
   21,895.54x = 390,813,994.32
5. Step 5: Solve for x
   x = 390,813,994.32/21,895.54
6. Step 6: Final answer
   x = 17,849.02