Finding the Fourth Proportional to 21,915.92, 30,242.04 and 12,356.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,915.92 : 30,242.04 = 12,356.48 : x
2. Step 2: Convert to fraction form
   21,915.92/30,242.04 = 12,356.48/x
3. Step 3: Cross multiply
   21,915.92x = 30,242.04 × 12,356.48
4. Step 4: Simplify right side
   21,915.92x = 373,685,162.42
5. Step 5: Solve for x
   x = 373,685,162.42/21,915.92
6. Step 6: Final answer
   x = 17,050.85