Finding the Fourth Proportional to 1,020.82, 1,408.71 and 555.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.82 : 1,408.71 = 555.08 : x
2. Step 2: Convert to fraction form
   1,020.82/1,408.71 = 555.08/x
3. Step 3: Cross multiply
   1,020.82x = 1,408.71 × 555.08
4. Step 4: Simplify right side
   1,020.82x = 781,946.75
5. Step 5: Solve for x
   x = 781,946.75/1,020.82
6. Step 6: Final answer
   x = 766.00