Finding the Fourth Proportional to 21,828.78, 30,123.72 and 12,397.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,828.78 : 30,123.72 = 12,397.32 : x
2. Step 2: Convert to fraction form
   21,828.78/30,123.72 = 12,397.32/x
3. Step 3: Cross multiply
   21,828.78x = 30,123.72 × 12,397.32
4. Step 4: Simplify right side
   21,828.78x = 373,453,396.43
5. Step 5: Solve for x
   x = 373,453,396.43/21,828.78
6. Step 6: Final answer
   x = 17,108.30