Finding the Fourth Proportional to 1,456.22, 2,181.90 and 1,021.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.22 : 2,181.90 = 1,021.25 : x
2. Step 2: Convert to fraction form
   1,456.22/2,181.90 = 1,021.25/x
3. Step 3: Cross multiply
   1,456.22x = 2,181.90 × 1,021.25
4. Step 4: Simplify right side
   1,456.22x = 2,228,265.38
5. Step 5: Solve for x
   x = 2,228,265.38/1,456.22
6. Step 6: Final answer
   x = 1,530.17