Finding the Fourth Proportional to 1,003.28, 1,505.69 and 448.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.28 : 1,505.69 = 448.16 : x
2. Step 2: Convert to fraction form
   1,003.28/1,505.69 = 448.16/x
3. Step 3: Cross multiply
   1,003.28x = 1,505.69 × 448.16
4. Step 4: Simplify right side
   1,003.28x = 674,780.26
5. Step 5: Solve for x
   x = 674,780.26/1,003.28
6. Step 6: Final answer
   x = 672.58