Finding the Fourth Proportional to 1,456.29, 2,182.37 and 840.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.29 : 2,182.37 = 840.15 : x
2. Step 2: Convert to fraction form
   1,456.29/2,182.37 = 840.15/x
3. Step 3: Cross multiply
   1,456.29x = 2,182.37 × 840.15
4. Step 4: Simplify right side
   1,456.29x = 1,833,518.16
5. Step 5: Solve for x
   x = 1,833,518.16/1,456.29
6. Step 6: Final answer
   x = 1,259.03