Finding the Fourth Proportional to 21,589, 29,792.91 and 12,157.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,589 : 29,792.91 = 12,157.72 : x
2. Step 2: Convert to fraction form
   21,589/29,792.91 = 12,157.72/x
3. Step 3: Cross multiply
   21,589x = 29,792.91 × 12,157.72
4. Step 4: Simplify right side
   21,589x = 362,213,857.77
5. Step 5: Solve for x
   x = 362,213,857.77/21,589
6. Step 6: Final answer
   x = 16,777.70