Finding the Fourth Proportional to 31,168.72, 43,012.62 and 17,021.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,168.72 : 43,012.62 = 17,021.57 : x
2. Step 2: Convert to fraction form
   31,168.72/43,012.62 = 17,021.57/x
3. Step 3: Cross multiply
   31,168.72x = 43,012.62 × 17,021.57
4. Step 4: Simplify right side
   31,168.72x = 732,142,322.21
5. Step 5: Solve for x
   x = 732,142,322.21/31,168.72
6. Step 6: Final answer
   x = 23,489.65