Finding the Fourth Proportional to 1,905.05, 2,857.59 and 672.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,905.05 : 2,857.59 = 672.18 : x
2. Step 2: Convert to fraction form
   1,905.05/2,857.59 = 672.18/x
3. Step 3: Cross multiply
   1,905.05x = 2,857.59 × 672.18
4. Step 4: Simplify right side
   1,905.05x = 1,920,820.20
5. Step 5: Solve for x
   x = 1,920,820.20/1,905.05
6. Step 6: Final answer
   x = 1,008.28