Finding the Fourth Proportional to 21,715.83, 29,969.01 and 12,155.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,715.83 : 29,969.01 = 12,155.13 : x
2. Step 2: Convert to fraction form
   21,715.83/29,969.01 = 12,155.13/x
3. Step 3: Cross multiply
   21,715.83x = 29,969.01 × 12,155.13
4. Step 4: Simplify right side
   21,715.83x = 364,277,212.52
5. Step 5: Solve for x
   x = 364,277,212.52/21,715.83
6. Step 6: Final answer
   x = 16,774.73