Finding the Fourth Proportional to 1,379.99, 1,902.33 and 1,007.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.99 : 1,902.33 = 1,007.39 : x
2. Step 2: Convert to fraction form
   1,379.99/1,902.33 = 1,007.39/x
3. Step 3: Cross multiply
   1,379.99x = 1,902.33 × 1,007.39
4. Step 4: Simplify right side
   1,379.99x = 1,916,388.22
5. Step 5: Solve for x
   x = 1,916,388.22/1,379.99
6. Step 6: Final answer
   x = 1,388.70