Finding the Fourth Proportional to 1,015.55, 1,401.46 and 549.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.55 : 1,401.46 = 549.80 : x
2. Step 2: Convert to fraction form
   1,015.55/1,401.46 = 549.80/x
3. Step 3: Cross multiply
   1,015.55x = 1,401.46 × 549.80
4. Step 4: Simplify right side
   1,015.55x = 770,522.71
5. Step 5: Solve for x
   x = 770,522.71/1,015.55
6. Step 6: Final answer
   x = 758.72