Finding the Fourth Proportional to 2,158.86, 2,978.52 and 1,319.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.86 : 2,978.52 = 1,319.26 : x
2. Step 2: Convert to fraction form
   2,158.86/2,978.52 = 1,319.26/x
3. Step 3: Cross multiply
   2,158.86x = 2,978.52 × 1,319.26
4. Step 4: Simplify right side
   2,158.86x = 3,929,442.30
5. Step 5: Solve for x
   x = 3,929,442.30/2,158.86
6. Step 6: Final answer
   x = 1,820.15