Finding the Fourth Proportional to 1,356.98, 1,872.07 and 1,003.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.98 : 1,872.07 = 1,003.72 : x
2. Step 2: Convert to fraction form
   1,356.98/1,872.07 = 1,003.72/x
3. Step 3: Cross multiply
   1,356.98x = 1,872.07 × 1,003.72
4. Step 4: Simplify right side
   1,356.98x = 1,879,034.10
5. Step 5: Solve for x
   x = 1,879,034.10/1,356.98
6. Step 6: Final answer
   x = 1,384.72