Finding the Fourth Proportional to 1,683.23, 2,521.60 and 818.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,683.23 : 2,521.60 = 818.15 : x
2. Step 2: Convert to fraction form
   1,683.23/2,521.60 = 818.15/x
3. Step 3: Cross multiply
   1,683.23x = 2,521.60 × 818.15
4. Step 4: Simplify right side
   1,683.23x = 2,063,047.04
5. Step 5: Solve for x
   x = 2,063,047.04/1,683.23
6. Step 6: Final answer
   x = 1,225.65