Finding the Fourth Proportional to 15,851.72, 21,875.33 and 9,137.30

Step by Step Solution

1. Step 1: Write the proportion equation
   15,851.72 : 21,875.33 = 9,137.30 : x
2. Step 2: Convert to fraction form
   15,851.72/21,875.33 = 9,137.30/x
3. Step 3: Cross multiply
   15,851.72x = 21,875.33 × 9,137.30
4. Step 4: Simplify right side
   15,851.72x = 199,881,297.75
5. Step 5: Solve for x
   x = 199,881,297.75/15,851.72
6. Step 6: Final answer
   x = 12,609.44