Finding the Fourth Proportional to 30,719.56, 42,396.78 and 17,291.40

Step by Step Solution

1. Step 1: Write the proportion equation
   30,719.56 : 42,396.78 = 17,291.40 : x
2. Step 2: Convert to fraction form
   30,719.56/42,396.78 = 17,291.40/x
3. Step 3: Cross multiply
   30,719.56x = 42,396.78 × 17,291.40
4. Step 4: Simplify right side
   30,719.56x = 733,099,681.69
5. Step 5: Solve for x
   x = 733,099,681.69/30,719.56
6. Step 6: Final answer
   x = 23,864.26