Finding the Fourth Proportional to 30,450.51, 42,021.59 and 17,021.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,450.51 : 42,021.59 = 17,021.75 : x
2. Step 2: Convert to fraction form
   30,450.51/42,021.59 = 17,021.75/x
3. Step 3: Cross multiply
   30,450.51x = 42,021.59 × 17,021.75
4. Step 4: Simplify right side
   30,450.51x = 715,280,704.37
5. Step 5: Solve for x
   x = 715,280,704.37/30,450.51
6. Step 6: Final answer
   x = 23,489.94