Finding the Fourth Proportional to 1,388.29, 2,067.70 and 1,381.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.29 : 2,067.70 = 1,381.59 : x
2. Step 2: Convert to fraction form
   1,388.29/2,067.70 = 1,381.59/x
3. Step 3: Cross multiply
   1,388.29x = 2,067.70 × 1,381.59
4. Step 4: Simplify right side
   1,388.29x = 2,856,703.30
5. Step 5: Solve for x
   x = 2,856,703.30/1,388.29
6. Step 6: Final answer
   x = 2,057.71