Finding the Fourth Proportional to 21,152.52, 29,191.32 and 11,721

Step by Step Solution

1. Step 1: Write the proportion equation
   21,152.52 : 29,191.32 = 11,721 : x
2. Step 2: Convert to fraction form
   21,152.52/29,191.32 = 11,721/x
3. Step 3: Cross multiply
   21,152.52x = 29,191.32 × 11,721
4. Step 4: Simplify right side
   21,152.52x = 342,151,461.72
5. Step 5: Solve for x
   x = 342,151,461.72/21,152.52
6. Step 6: Final answer
   x = 16,175.45