Finding the Fourth Proportional to 21,824.32, 30,114.03 and 12,870.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,824.32 : 30,114.03 = 12,870.58 : x
2. Step 2: Convert to fraction form
   21,824.32/30,114.03 = 12,870.58/x
3. Step 3: Cross multiply
   21,824.32x = 30,114.03 × 12,870.58
4. Step 4: Simplify right side
   21,824.32x = 387,585,032.24
5. Step 5: Solve for x
   x = 387,585,032.24/21,824.32
6. Step 6: Final answer
   x = 17,759.32