Finding the Fourth Proportional to 1,015.56, 1,392.38 and 1,003.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.56 : 1,392.38 = 1,003.10 : x
2. Step 2: Convert to fraction form
   1,015.56/1,392.38 = 1,003.10/x
3. Step 3: Cross multiply
   1,015.56x = 1,392.38 × 1,003.10
4. Step 4: Simplify right side
   1,015.56x = 1,396,684.40
5. Step 5: Solve for x
   x = 1,396,684.40/1,015.56
6. Step 6: Final answer
   x = 1,375.28