Finding the Fourth Proportional to 1,021.69, 1,400.72 and 1,003.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.69 : 1,400.72 = 1,003.24 : x
2. Step 2: Convert to fraction form
   1,021.69/1,400.72 = 1,003.24/x
3. Step 3: Cross multiply
   1,021.69x = 1,400.72 × 1,003.24
4. Step 4: Simplify right side
   1,021.69x = 1,405,250.01
5. Step 5: Solve for x
   x = 1,405,250.01/1,021.69
6. Step 6: Final answer
   x = 1,375.42