Finding the Fourth Proportional to 2,117.59, 3,176.35 and 818.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.59 : 3,176.35 = 818.15 : x
2. Step 2: Convert to fraction form
   2,117.59/3,176.35 = 818.15/x
3. Step 3: Cross multiply
   2,117.59x = 3,176.35 × 818.15
4. Step 4: Simplify right side
   2,117.59x = 2,598,712.83
5. Step 5: Solve for x
   x = 2,598,712.83/2,117.59
6. Step 6: Final answer
   x = 1,227.20