Finding the Fourth Proportional to 21,829.76, 30,123.12 and 12,396.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,829.76 : 30,123.12 = 12,396.56 : x
2. Step 2: Convert to fraction form
   21,829.76/30,123.12 = 12,396.56/x
3. Step 3: Cross multiply
   21,829.76x = 30,123.12 × 12,396.56
4. Step 4: Simplify right side
   21,829.76x = 373,423,064.47
5. Step 5: Solve for x
   x = 373,423,064.47/21,829.76
6. Step 6: Final answer
   x = 17,106.15