Finding the Fourth Proportional to 21,447.86, 29,595.57 and 12,955.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,447.86 : 29,595.57 = 12,955.10 : x
2. Step 2: Convert to fraction form
   21,447.86/29,595.57 = 12,955.10/x
3. Step 3: Cross multiply
   21,447.86x = 29,595.57 × 12,955.10
4. Step 4: Simplify right side
   21,447.86x = 383,413,568.91
5. Step 5: Solve for x
   x = 383,413,568.91/21,447.86
6. Step 6: Final answer
   x = 17,876.54