Finding the Fourth Proportional to 2,118.57, 3,176.43 and 818.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.57 : 3,176.43 = 818.52 : x
2. Step 2: Convert to fraction form
   2,118.57/3,176.43 = 818.52/x
3. Step 3: Cross multiply
   2,118.57x = 3,176.43 × 818.52
4. Step 4: Simplify right side
   2,118.57x = 2,599,971.48
5. Step 5: Solve for x
   x = 2,599,971.48/2,118.57
6. Step 6: Final answer
   x = 1,227.23