Finding the Fourth Proportional to 1,013.50, 1,394.59 and 1,007.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.50 : 1,394.59 = 1,007.12 : x
2. Step 2: Convert to fraction form
   1,013.50/1,394.59 = 1,007.12/x
3. Step 3: Cross multiply
   1,013.50x = 1,394.59 × 1,007.12
4. Step 4: Simplify right side
   1,013.50x = 1,404,517.33
5. Step 5: Solve for x
   x = 1,404,517.33/1,013.50
6. Step 6: Final answer
   x = 1,385.81