Finding the Fourth Proportional to 1,491.74, 2,058.56 and 828.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.74 : 2,058.56 = 828.57 : x
2. Step 2: Convert to fraction form
   1,491.74/2,058.56 = 828.57/x
3. Step 3: Cross multiply
   1,491.74x = 2,058.56 × 828.57
4. Step 4: Simplify right side
   1,491.74x = 1,705,667.74
5. Step 5: Solve for x
   x = 1,705,667.74/1,491.74
6. Step 6: Final answer
   x = 1,143.41