Finding the Fourth Proportional to 1,015.45, 1,401.33 and 549.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.45 : 1,401.33 = 549.70 : x
2. Step 2: Convert to fraction form
   1,015.45/1,401.33 = 549.70/x
3. Step 3: Cross multiply
   1,015.45x = 1,401.33 × 549.70
4. Step 4: Simplify right side
   1,015.45x = 770,317.54
5. Step 5: Solve for x
   x = 770,317.54/1,015.45
6. Step 6: Final answer
   x = 758.59