Finding the Fourth Proportional to 1,383.03, 1,908 and 990.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.03 : 1,908 = 990.59 : x
2. Step 2: Convert to fraction form
   1,383.03/1,908 = 990.59/x
3. Step 3: Cross multiply
   1,383.03x = 1,908 × 990.59
4. Step 4: Simplify right side
   1,383.03x = 1,890,036.18
5. Step 5: Solve for x
   x = 1,890,036.18/1,383.03
6. Step 6: Final answer
   x = 1,366.59