Finding the Fourth Proportional to 1,402.87, 2,103.37 and 672.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.87 : 2,103.37 = 672.05 : x
2. Step 2: Convert to fraction form
   1,402.87/2,103.37 = 672.05/x
3. Step 3: Cross multiply
   1,402.87x = 2,103.37 × 672.05
4. Step 4: Simplify right side
   1,402.87x = 1,413,561.56
5. Step 5: Solve for x
   x = 1,413,561.56/1,402.87
6. Step 6: Final answer
   x = 1,007.62