Finding the Fourth Proportional to 1,020.17, 1,407.83 and 554.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.17 : 1,407.83 = 554.42 : x
2. Step 2: Convert to fraction form
   1,020.17/1,407.83 = 554.42/x
3. Step 3: Cross multiply
   1,020.17x = 1,407.83 × 554.42
4. Step 4: Simplify right side
   1,020.17x = 780,523.46
5. Step 5: Solve for x
   x = 780,523.46/1,020.17
6. Step 6: Final answer
   x = 765.10