Finding the Fourth Proportional to 1,683.98, 2,522.72 and 818.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,683.98 : 2,522.72 = 818.90 : x
2. Step 2: Convert to fraction form
   1,683.98/2,522.72 = 818.90/x
3. Step 3: Cross multiply
   1,683.98x = 2,522.72 × 818.90
4. Step 4: Simplify right side
   1,683.98x = 2,065,855.41
5. Step 5: Solve for x
   x = 2,065,855.41/1,683.98
6. Step 6: Final answer
   x = 1,226.77