Finding the Fourth Proportional to 2,132.78, 3,199.30 and 671.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,132.78 : 3,199.30 = 671.98 : x
2. Step 2: Convert to fraction form
   2,132.78/3,199.30 = 671.98/x
3. Step 3: Cross multiply
   2,132.78x = 3,199.30 × 671.98
4. Step 4: Simplify right side
   2,132.78x = 2,149,865.61
5. Step 5: Solve for x
   x = 2,149,865.61/2,132.78
6. Step 6: Final answer
   x = 1,008.01