Finding the Fourth Proportional to 1,662.39, 2,493.86 and 840.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.39 : 2,493.86 = 840.33 : x
2. Step 2: Convert to fraction form
   1,662.39/2,493.86 = 840.33/x
3. Step 3: Cross multiply
   1,662.39x = 2,493.86 × 840.33
4. Step 4: Simplify right side
   1,662.39x = 2,095,661.17
5. Step 5: Solve for x
   x = 2,095,661.17/1,662.39
6. Step 6: Final answer
   x = 1,260.63