Finding the Fourth Proportional to 2,015.42, 2,778.81 and 1,384.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.42 : 2,778.81 = 1,384.70 : x
2. Step 2: Convert to fraction form
   2,015.42/2,778.81 = 1,384.70/x
3. Step 3: Cross multiply
   2,015.42x = 2,778.81 × 1,384.70
4. Step 4: Simplify right side
   2,015.42x = 3,847,818.21
5. Step 5: Solve for x
   x = 3,847,818.21/2,015.42
6. Step 6: Final answer
   x = 1,909.19