Finding the Fourth Proportional to 21,379.34, 29,503.28 and 11,947.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,379.34 : 29,503.28 = 11,947.91 : x
2. Step 2: Convert to fraction form
   21,379.34/29,503.28 = 11,947.91/x
3. Step 3: Cross multiply
   21,379.34x = 29,503.28 × 11,947.91
4. Step 4: Simplify right side
   21,379.34x = 352,502,326.89
5. Step 5: Solve for x
   x = 352,502,326.89/21,379.34
6. Step 6: Final answer
   x = 16,487.99