Finding the Fourth Proportional to 1,401.90, 2,100.78 and 671.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.90 : 2,100.78 = 671.82 : x
2. Step 2: Convert to fraction form
   1,401.90/2,100.78 = 671.82/x
3. Step 3: Cross multiply
   1,401.90x = 2,100.78 × 671.82
4. Step 4: Simplify right side
   1,401.90x = 1,411,346.02
5. Step 5: Solve for x
   x = 1,411,346.02/1,401.90
6. Step 6: Final answer
   x = 1,006.74