Finding the Fourth Proportional to 1,401.50, 2,100.84 and 671.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.50 : 2,100.84 = 671.60 : x
2. Step 2: Convert to fraction form
   1,401.50/2,100.84 = 671.60/x
3. Step 3: Cross multiply
   1,401.50x = 2,100.84 × 671.60
4. Step 4: Simplify right side
   1,401.50x = 1,410,913.64
5. Step 5: Solve for x
   x = 1,410,913.64/1,401.50
6. Step 6: Final answer
   x = 1,006.72