Finding the Fourth Proportional to 1,019.79, 1,407.31 and 554.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.79 : 1,407.31 = 554.04 : x
2. Step 2: Convert to fraction form
   1,019.79/1,407.31 = 554.04/x
3. Step 3: Cross multiply
   1,019.79x = 1,407.31 × 554.04
4. Step 4: Simplify right side
   1,019.79x = 779,704.65
5. Step 5: Solve for x
   x = 779,704.65/1,019.79
6. Step 6: Final answer
   x = 764.57