Finding the Fourth Proportional to 21,996.16, 30,347.56 and 12,435.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,996.16 : 30,347.56 = 12,435.12 : x
2. Step 2: Convert to fraction form
   21,996.16/30,347.56 = 12,435.12/x
3. Step 3: Cross multiply
   21,996.16x = 30,347.56 × 12,435.12
4. Step 4: Simplify right side
   21,996.16x = 377,375,550.31
5. Step 5: Solve for x
   x = 377,375,550.31/21,996.16
6. Step 6: Final answer
   x = 17,156.43