Finding the Fourth Proportional to 21,657, 29,887.25 and 13,156.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,657 : 29,887.25 = 13,156.23 : x
2. Step 2: Convert to fraction form
   21,657/29,887.25 = 13,156.23/x
3. Step 3: Cross multiply
   21,657x = 29,887.25 × 13,156.23
4. Step 4: Simplify right side
   21,657x = 393,203,469.29
5. Step 5: Solve for x
   x = 393,203,469.29/21,657
6. Step 6: Final answer
   x = 18,155.95