Finding the Fourth Proportional to 1,019.98, 1,407.56 and 554.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.98 : 1,407.56 = 554.23 : x
2. Step 2: Convert to fraction form
   1,019.98/1,407.56 = 554.23/x
3. Step 3: Cross multiply
   1,019.98x = 1,407.56 × 554.23
4. Step 4: Simplify right side
   1,019.98x = 780,111.98
5. Step 5: Solve for x
   x = 780,111.98/1,019.98
6. Step 6: Final answer
   x = 764.83