Finding the Fourth Proportional to 1,002.40, 1,383.30 and 554.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.40 : 1,383.30 = 554.27 : x
2. Step 2: Convert to fraction form
   1,002.40/1,383.30 = 554.27/x
3. Step 3: Cross multiply
   1,002.40x = 1,383.30 × 554.27
4. Step 4: Simplify right side
   1,002.40x = 766,725.15
5. Step 5: Solve for x
   x = 766,725.15/1,002.40
6. Step 6: Final answer
   x = 764.89