Finding the Fourth Proportional to 30,570.64, 42,189.24 and 17,146.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,570.64 : 42,189.24 = 17,146.20 : x
2. Step 2: Convert to fraction form
   30,570.64/42,189.24 = 17,146.20/x
3. Step 3: Cross multiply
   30,570.64x = 42,189.24 × 17,146.20
4. Step 4: Simplify right side
   30,570.64x = 723,385,146.89
5. Step 5: Solve for x
   x = 723,385,146.89/30,570.64
6. Step 6: Final answer
   x = 23,662.74