Finding the Fourth Proportional to 30,556.71, 42,169.41 and 17,128.23

Step by Step Solution

1. Step 1: Write the proportion equation
   30,556.71 : 42,169.41 = 17,128.23 : x
2. Step 2: Convert to fraction form
   30,556.71/42,169.41 = 17,128.23/x
3. Step 3: Cross multiply
   30,556.71x = 42,169.41 × 17,128.23
4. Step 4: Simplify right side
   30,556.71x = 722,287,195.31
5. Step 5: Solve for x
   x = 722,287,195.31/30,556.71
6. Step 6: Final answer
   x = 23,637.60