Finding the Fourth Proportional to 1,042.39, 1,419.22 and 1,039.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.39 : 1,419.22 = 1,039.15 : x
2. Step 2: Convert to fraction form
   1,042.39/1,419.22 = 1,039.15/x
3. Step 3: Cross multiply
   1,042.39x = 1,419.22 × 1,039.15
4. Step 4: Simplify right side
   1,042.39x = 1,474,782.46
5. Step 5: Solve for x
   x = 1,474,782.46/1,042.39
6. Step 6: Final answer
   x = 1,414.81