Finding the Fourth Proportional to 21,582.72, 29,785.32 and 12,152.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,582.72 : 29,785.32 = 12,152.16 : x
2. Step 2: Convert to fraction form
   21,582.72/29,785.32 = 12,152.16/x
3. Step 3: Cross multiply
   21,582.72x = 29,785.32 × 12,152.16
4. Step 4: Simplify right side
   21,582.72x = 361,955,974.29
5. Step 5: Solve for x
   x = 361,955,974.29/21,582.72
6. Step 6: Final answer
   x = 16,770.64