Finding the Fourth Proportional to 1,685.88, 2,525.76 and 818.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.88 : 2,525.76 = 818.28 : x
2. Step 2: Convert to fraction form
   1,685.88/2,525.76 = 818.28/x
3. Step 3: Cross multiply
   1,685.88x = 2,525.76 × 818.28
4. Step 4: Simplify right side
   1,685.88x = 2,066,778.89
5. Step 5: Solve for x
   x = 2,066,778.89/1,685.88
6. Step 6: Final answer
   x = 1,225.93