Finding the Fourth Proportional to 2,379.82, 3,284.34 and 1,385.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.82 : 3,284.34 = 1,385.40 : x
2. Step 2: Convert to fraction form
   2,379.82/3,284.34 = 1,385.40/x
3. Step 3: Cross multiply
   2,379.82x = 3,284.34 × 1,385.40
4. Step 4: Simplify right side
   2,379.82x = 4,550,124.64
5. Step 5: Solve for x
   x = 4,550,124.64/2,379.82
6. Step 6: Final answer
   x = 1,911.96