Finding the Fourth Proportional to 21,648.30, 29,875.05 and 12,215.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,648.30 : 29,875.05 = 12,215.04 : x
2. Step 2: Convert to fraction form
   21,648.30/29,875.05 = 12,215.04/x
3. Step 3: Cross multiply
   21,648.30x = 29,875.05 × 12,215.04
4. Step 4: Simplify right side
   21,648.30x = 364,924,930.75
5. Step 5: Solve for x
   x = 364,924,930.75/21,648.30
6. Step 6: Final answer
   x = 16,856.98