Finding the Fourth Proportional to 1,390.46, 2,083.37 and 978.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.46 : 2,083.37 = 978.73 : x
2. Step 2: Convert to fraction form
   1,390.46/2,083.37 = 978.73/x
3. Step 3: Cross multiply
   1,390.46x = 2,083.37 × 978.73
4. Step 4: Simplify right side
   1,390.46x = 2,039,056.72
5. Step 5: Solve for x
   x = 2,039,056.72/1,390.46
6. Step 6: Final answer
   x = 1,466.46