Finding the Fourth Proportional to 2,818.35, 3,890.16 and 1,823.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,818.35 : 3,890.16 = 1,823.60 : x
2. Step 2: Convert to fraction form
   2,818.35/3,890.16 = 1,823.60/x
3. Step 3: Cross multiply
   2,818.35x = 3,890.16 × 1,823.60
4. Step 4: Simplify right side
   2,818.35x = 7,094,105.50
5. Step 5: Solve for x
   x = 7,094,105.50/2,818.35
6. Step 6: Final answer
   x = 2,517.11