Finding the Fourth Proportional to 1,019.75, 1,407.21 and 554.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.75 : 1,407.21 = 554.00 : x
2. Step 2: Convert to fraction form
   1,019.75/1,407.21 = 554.00/x
3. Step 3: Cross multiply
   1,019.75x = 1,407.21 × 554.00
4. Step 4: Simplify right side
   1,019.75x = 779,587.30
5. Step 5: Solve for x
   x = 779,587.30/1,019.75
6. Step 6: Final answer
   x = 764.49