Finding the Fourth Proportional to 1,395.18, 2,089.53 and 818.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.18 : 2,089.53 = 818.46 : x
2. Step 2: Convert to fraction form
   1,395.18/2,089.53 = 818.46/x
3. Step 3: Cross multiply
   1,395.18x = 2,089.53 × 818.46
4. Step 4: Simplify right side
   1,395.18x = 1,710,196.72
5. Step 5: Solve for x
   x = 1,710,196.72/1,395.18
6. Step 6: Final answer
   x = 1,225.79