Finding the Fourth Proportional to 1,003.12, 1,505.04 and 681.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.12 : 1,505.04 = 681.52 : x
2. Step 2: Convert to fraction form
   1,003.12/1,505.04 = 681.52/x
3. Step 3: Cross multiply
   1,003.12x = 1,505.04 × 681.52
4. Step 4: Simplify right side
   1,003.12x = 1,025,714.86
5. Step 5: Solve for x
   x = 1,025,714.86/1,003.12
6. Step 6: Final answer
   x = 1,022.52