Finding the Fourth Proportional to 1,405.49, 1,939.71 and 1,012.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.49 : 1,939.71 = 1,012.74 : x
2. Step 2: Convert to fraction form
   1,405.49/1,939.71 = 1,012.74/x
3. Step 3: Cross multiply
   1,405.49x = 1,939.71 × 1,012.74
4. Step 4: Simplify right side
   1,405.49x = 1,964,418.43
5. Step 5: Solve for x
   x = 1,964,418.43/1,405.49
6. Step 6: Final answer
   x = 1,397.68