Finding the Fourth Proportional to 21,017.80, 31,527.42 and 7,165

Step by Step Solution

1. Step 1: Write the proportion equation
   21,017.80 : 31,527.42 = 7,165 : x
2. Step 2: Convert to fraction form
   21,017.80/31,527.42 = 7,165/x
3. Step 3: Cross multiply
   21,017.80x = 31,527.42 × 7,165
4. Step 4: Simplify right side
   21,017.80x = 225,893,964.30
5. Step 5: Solve for x
   x = 225,893,964.30/21,017.80
6. Step 6: Final answer
   x = 10,747.75