Finding the Fourth Proportional to 1,019.94, 1,407.52 and 554.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.94 : 1,407.52 = 554.20 : x
2. Step 2: Convert to fraction form
   1,019.94/1,407.52 = 554.20/x
3. Step 3: Cross multiply
   1,019.94x = 1,407.52 × 554.20
4. Step 4: Simplify right side
   1,019.94x = 780,047.58
5. Step 5: Solve for x
   x = 780,047.58/1,019.94
6. Step 6: Final answer
   x = 764.80