Finding the Fourth Proportional to 1,686.35, 2,528.41 and 808.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.35 : 2,528.41 = 808.83 : x
2. Step 2: Convert to fraction form
   1,686.35/2,528.41 = 808.83/x
3. Step 3: Cross multiply
   1,686.35x = 2,528.41 × 808.83
4. Step 4: Simplify right side
   1,686.35x = 2,045,041.22
5. Step 5: Solve for x
   x = 2,045,041.22/1,686.35
6. Step 6: Final answer
   x = 1,212.71