Finding the Fourth Proportional to 25,837.72, 35,661.42 and 15,231

Step by Step Solution

1. Step 1: Write the proportion equation
   25,837.72 : 35,661.42 = 15,231 : x
2. Step 2: Convert to fraction form
   25,837.72/35,661.42 = 15,231/x
3. Step 3: Cross multiply
   25,837.72x = 35,661.42 × 15,231
4. Step 4: Simplify right side
   25,837.72x = 543,159,088.02
5. Step 5: Solve for x
   x = 543,159,088.02/25,837.72
6. Step 6: Final answer
   x = 21,021.94