Finding the Fourth Proportional to 21,238.72, 29,301.60 and 12,852.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.72 : 29,301.60 = 12,852.16 : x
2. Step 2: Convert to fraction form
   21,238.72/29,301.60 = 12,852.16/x
3. Step 3: Cross multiply
   21,238.72x = 29,301.60 × 12,852.16
4. Step 4: Simplify right side
   21,238.72x = 376,588,851.46
5. Step 5: Solve for x
   x = 376,588,851.46/21,238.72
6. Step 6: Final answer
   x = 17,731.24