Finding the Fourth Proportional to 30,715.40, 42,386.72 and 17,286.64

Step by Step Solution

1. Step 1: Write the proportion equation
   30,715.40 : 42,386.72 = 17,286.64 : x
2. Step 2: Convert to fraction form
   30,715.40/42,386.72 = 17,286.64/x
3. Step 3: Cross multiply
   30,715.40x = 42,386.72 × 17,286.64
4. Step 4: Simplify right side
   30,715.40x = 732,723,969.42
5. Step 5: Solve for x
   x = 732,723,969.42/30,715.40
6. Step 6: Final answer
   x = 23,855.26