Finding the Fourth Proportional to 1,380.21, 2,067.89 and 1,298.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.21 : 2,067.89 = 1,298.00 : x
2. Step 2: Convert to fraction form
   1,380.21/2,067.89 = 1,298.00/x
3. Step 3: Cross multiply
   1,380.21x = 2,067.89 × 1,298.00
4. Step 4: Simplify right side
   1,380.21x = 2,684,104.39
5. Step 5: Solve for x
   x = 2,684,104.39/1,380.21
6. Step 6: Final answer
   x = 1,944.71