Finding the Fourth Proportional to 1,478.33, 2,039.69 and 840.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.33 : 2,039.69 = 840.26 : x
2. Step 2: Convert to fraction form
   1,478.33/2,039.69 = 840.26/x
3. Step 3: Cross multiply
   1,478.33x = 2,039.69 × 840.26
4. Step 4: Simplify right side
   1,478.33x = 1,713,855.52
5. Step 5: Solve for x
   x = 1,713,855.52/1,478.33
6. Step 6: Final answer
   x = 1,159.32