Finding the Fourth Proportional to 2,820.42, 4,229.70 and 971.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.42 : 4,229.70 = 971.49 : x
2. Step 2: Convert to fraction form
   2,820.42/4,229.70 = 971.49/x
3. Step 3: Cross multiply
   2,820.42x = 4,229.70 × 971.49
4. Step 4: Simplify right side
   2,820.42x = 4,109,111.25
5. Step 5: Solve for x
   x = 4,109,111.25/2,820.42
6. Step 6: Final answer
   x = 1,456.91