Finding the Fourth Proportional to 1,306.10, 1,959.59 and 818.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,306.10 : 1,959.59 = 818.57 : x
2. Step 2: Convert to fraction form
   1,306.10/1,959.59 = 818.57/x
3. Step 3: Cross multiply
   1,306.10x = 1,959.59 × 818.57
4. Step 4: Simplify right side
   1,306.10x = 1,604,053.83
5. Step 5: Solve for x
   x = 1,604,053.83/1,306.10
6. Step 6: Final answer
   x = 1,228.13