Finding the Fourth Proportional to 1,380.59, 1,908.96 and 1,358.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.59 : 1,908.96 = 1,358.34 : x
2. Step 2: Convert to fraction form
   1,380.59/1,908.96 = 1,358.34/x
3. Step 3: Cross multiply
   1,380.59x = 1,908.96 × 1,358.34
4. Step 4: Simplify right side
   1,380.59x = 2,593,016.73
5. Step 5: Solve for x
   x = 2,593,016.73/1,380.59
6. Step 6: Final answer
   x = 1,878.19