Finding the Fourth Proportional to 1,401.80, 2,103.10 and 671.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.80 : 2,103.10 = 671.99 : x
2. Step 2: Convert to fraction form
   1,401.80/2,103.10 = 671.99/x
3. Step 3: Cross multiply
   1,401.80x = 2,103.10 × 671.99
4. Step 4: Simplify right side
   1,401.80x = 1,413,249.97
5. Step 5: Solve for x
   x = 1,413,249.97/1,401.80
6. Step 6: Final answer
   x = 1,008.17