Finding the Fourth Proportional to 1,357.76, 1,874.55 and 1,042.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.76 : 1,874.55 = 1,042.42 : x
2. Step 2: Convert to fraction form
   1,357.76/1,874.55 = 1,042.42/x
3. Step 3: Cross multiply
   1,357.76x = 1,874.55 × 1,042.42
4. Step 4: Simplify right side
   1,357.76x = 1,954,068.41
5. Step 5: Solve for x
   x = 1,954,068.41/1,357.76
6. Step 6: Final answer
   x = 1,439.19