Finding the Fourth Proportional to 2,819.67, 3,891.15 and 1,970.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.67 : 3,891.15 = 1,970.16 : x
2. Step 2: Convert to fraction form
   2,819.67/3,891.15 = 1,970.16/x
3. Step 3: Cross multiply
   2,819.67x = 3,891.15 × 1,970.16
4. Step 4: Simplify right side
   2,819.67x = 7,666,188.08
5. Step 5: Solve for x
   x = 7,666,188.08/2,819.67
6. Step 6: Final answer
   x = 2,718.82