Finding the Fourth Proportional to 2,115.69, 2,919.69 and 1,319.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.69 : 2,919.69 = 1,319.34 : x
2. Step 2: Convert to fraction form
   2,115.69/2,919.69 = 1,319.34/x
3. Step 3: Cross multiply
   2,115.69x = 2,919.69 × 1,319.34
4. Step 4: Simplify right side
   2,115.69x = 3,852,063.80
5. Step 5: Solve for x
   x = 3,852,063.80/2,115.69
6. Step 6: Final answer
   x = 1,820.71