Finding the Fourth Proportional to 1,019.81, 1,407.35 and 554.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.81 : 1,407.35 = 554.06 : x
2. Step 2: Convert to fraction form
   1,019.81/1,407.35 = 554.06/x
3. Step 3: Cross multiply
   1,019.81x = 1,407.35 × 554.06
4. Step 4: Simplify right side
   1,019.81x = 779,761.24
5. Step 5: Solve for x
   x = 779,761.24/1,019.81
6. Step 6: Final answer
   x = 764.61