Finding the Fourth Proportional to 1,989.63, 2,978.98 and 1,371.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.63 : 2,978.98 = 1,371.80 : x
2. Step 2: Convert to fraction form
   1,989.63/2,978.98 = 1,371.80/x
3. Step 3: Cross multiply
   1,989.63x = 2,978.98 × 1,371.80
4. Step 4: Simplify right side
   1,989.63x = 4,086,568.78
5. Step 5: Solve for x
   x = 4,086,568.78/1,989.63
6. Step 6: Final answer
   x = 2,053.93