Finding the Fourth Proportional to 21,938.84, 30,275.59 and 12,380.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,938.84 : 30,275.59 = 12,380.75 : x
2. Step 2: Convert to fraction form
   21,938.84/30,275.59 = 12,380.75/x
3. Step 3: Cross multiply
   21,938.84x = 30,275.59 × 12,380.75
4. Step 4: Simplify right side
   21,938.84x = 374,834,297.61
5. Step 5: Solve for x
   x = 374,834,297.61/21,938.84
6. Step 6: Final answer
   x = 17,085.42