Finding the Fourth Proportional to 21,591, 29,795.67 and 12,159.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,591 : 29,795.67 = 12,159.72 : x
2. Step 2: Convert to fraction form
   21,591/29,795.67 = 12,159.72/x
3. Step 3: Cross multiply
   21,591x = 29,795.67 × 12,159.72
4. Step 4: Simplify right side
   21,591x = 362,307,004.41
5. Step 5: Solve for x
   x = 362,307,004.41/21,591
6. Step 6: Final answer
   x = 16,780.46