Finding the Fourth Proportional to 1,808.69, 2,713.37 and 821.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,808.69 : 2,713.37 = 821.57 : x
2. Step 2: Convert to fraction form
   1,808.69/2,713.37 = 821.57/x
3. Step 3: Cross multiply
   1,808.69x = 2,713.37 × 821.57
4. Step 4: Simplify right side
   1,808.69x = 2,229,215.89
5. Step 5: Solve for x
   x = 2,229,215.89/1,808.69
6. Step 6: Final answer
   x = 1,232.51