Finding the Fourth Proportional to 1,380.98, 1,907.42 and 1,007.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.98 : 1,907.42 = 1,007.37 : x
2. Step 2: Convert to fraction form
   1,380.98/1,907.42 = 1,007.37/x
3. Step 3: Cross multiply
   1,380.98x = 1,907.42 × 1,007.37
4. Step 4: Simplify right side
   1,380.98x = 1,921,472.65
5. Step 5: Solve for x
   x = 1,921,472.65/1,380.98
6. Step 6: Final answer
   x = 1,391.38