Finding the Fourth Proportional to 1,402.38, 2,103.63 and 672.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.38 : 2,103.63 = 672.18 : x
2. Step 2: Convert to fraction form
   1,402.38/2,103.63 = 672.18/x
3. Step 3: Cross multiply
   1,402.38x = 2,103.63 × 672.18
4. Step 4: Simplify right side
   1,402.38x = 1,414,018.01
5. Step 5: Solve for x
   x = 1,414,018.01/1,402.38
6. Step 6: Final answer
   x = 1,008.30