Finding the Fourth Proportional to 2,117.67, 3,175.86 and 818.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.67 : 3,175.86 = 818.82 : x
2. Step 2: Convert to fraction form
   2,117.67/3,175.86 = 818.82/x
3. Step 3: Cross multiply
   2,117.67x = 3,175.86 × 818.82
4. Step 4: Simplify right side
   2,117.67x = 2,600,457.69
5. Step 5: Solve for x
   x = 2,600,457.69/2,117.67
6. Step 6: Final answer
   x = 1,227.98