Finding the Fourth Proportional to 21,978.16, 30,329.88 and 12,042.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.16 : 30,329.88 = 12,042.16 : x
2. Step 2: Convert to fraction form
   21,978.16/30,329.88 = 12,042.16/x
3. Step 3: Cross multiply
   21,978.16x = 30,329.88 × 12,042.16
4. Step 4: Simplify right side
   21,978.16x = 365,237,267.74
5. Step 5: Solve for x
   x = 365,237,267.74/21,978.16
6. Step 6: Final answer
   x = 16,618.19