Finding the Fourth Proportional to 2,158.60, 2,978.76 and 1,319.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.60 : 2,978.76 = 1,319.14 : x
2. Step 2: Convert to fraction form
   2,158.60/2,978.76 = 1,319.14/x
3. Step 3: Cross multiply
   2,158.60x = 2,978.76 × 1,319.14
4. Step 4: Simplify right side
   2,158.60x = 3,929,401.47
5. Step 5: Solve for x
   x = 3,929,401.47/2,158.60
6. Step 6: Final answer
   x = 1,820.35