Finding the Fourth Proportional to 21,601.12, 29,807.76 and 12,172

Step by Step Solution

1. Step 1: Write the proportion equation
   21,601.12 : 29,807.76 = 12,172 : x
2. Step 2: Convert to fraction form
   21,601.12/29,807.76 = 12,172/x
3. Step 3: Cross multiply
   21,601.12x = 29,807.76 × 12,172
4. Step 4: Simplify right side
   21,601.12x = 362,820,054.72
5. Step 5: Solve for x
   x = 362,820,054.72/21,601.12
6. Step 6: Final answer
   x = 16,796.35