Finding the Fourth Proportional to 1,402.54, 2,100.86 and 671.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.54 : 2,100.86 = 671.38 : x
2. Step 2: Convert to fraction form
   1,402.54/2,100.86 = 671.38/x
3. Step 3: Cross multiply
   1,402.54x = 2,100.86 × 671.38
4. Step 4: Simplify right side
   1,402.54x = 1,410,472.03
5. Step 5: Solve for x
   x = 1,410,472.03/1,402.54
6. Step 6: Final answer
   x = 1,005.66