Finding the Fourth Proportional to 1,020.04, 1,407.61 and 554.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.04 : 1,407.61 = 554.29 : x
2. Step 2: Convert to fraction form
   1,020.04/1,407.61 = 554.29/x
3. Step 3: Cross multiply
   1,020.04x = 1,407.61 × 554.29
4. Step 4: Simplify right side
   1,020.04x = 780,224.15
5. Step 5: Solve for x
   x = 780,224.15/1,020.04
6. Step 6: Final answer
   x = 764.90