Finding the Fourth Proportional to 21,396.83, 29,526.12 and 12,443.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,396.83 : 29,526.12 = 12,443.72 : x
2. Step 2: Convert to fraction form
   21,396.83/29,526.12 = 12,443.72/x
3. Step 3: Cross multiply
   21,396.83x = 29,526.12 × 12,443.72
4. Step 4: Simplify right side
   21,396.83x = 367,414,622.34
5. Step 5: Solve for x
   x = 367,414,622.34/21,396.83
6. Step 6: Final answer
   x = 17,171.46