Finding the Fourth Proportional to 21,979.74, 30,342.52 and 12,546.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,979.74 : 30,342.52 = 12,546.48 : x
2. Step 2: Convert to fraction form
   21,979.74/30,342.52 = 12,546.48/x
3. Step 3: Cross multiply
   21,979.74x = 30,342.52 × 12,546.48
4. Step 4: Simplify right side
   21,979.74x = 380,691,820.33
5. Step 5: Solve for x
   x = 380,691,820.33/21,979.74
6. Step 6: Final answer
   x = 17,320.12