Finding the Fourth Proportional to 1,342.74, 1,853.37 and 819.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.74 : 1,853.37 = 819.72 : x
2. Step 2: Convert to fraction form
   1,342.74/1,853.37 = 819.72/x
3. Step 3: Cross multiply
   1,342.74x = 1,853.37 × 819.72
4. Step 4: Simplify right side
   1,342.74x = 1,519,244.46
5. Step 5: Solve for x
   x = 1,519,244.46/1,342.74
6. Step 6: Final answer
   x = 1,131.45