Finding the Fourth Proportional to 2,158.83, 2,978.28 and 1,319.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.83 : 2,978.28 = 1,319.34 : x
2. Step 2: Convert to fraction form
   2,158.83/2,978.28 = 1,319.34/x
3. Step 3: Cross multiply
   2,158.83x = 2,978.28 × 1,319.34
4. Step 4: Simplify right side
   2,158.83x = 3,929,363.94
5. Step 5: Solve for x
   x = 3,929,363.94/2,158.83
6. Step 6: Final answer
   x = 1,820.14