Finding the Fourth Proportional to 1,342.58, 1,852.20 and 818.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.58 : 1,852.20 = 818.55 : x
2. Step 2: Convert to fraction form
   1,342.58/1,852.20 = 818.55/x
3. Step 3: Cross multiply
   1,342.58x = 1,852.20 × 818.55
4. Step 4: Simplify right side
   1,342.58x = 1,516,118.31
5. Step 5: Solve for x
   x = 1,516,118.31/1,342.58
6. Step 6: Final answer
   x = 1,129.26