Finding the Fourth Proportional to 2,158.48, 2,978.76 and 1,330

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.48 : 2,978.76 = 1,330 : x
2. Step 2: Convert to fraction form
   2,158.48/2,978.76 = 1,330/x
3. Step 3: Cross multiply
   2,158.48x = 2,978.76 × 1,330
4. Step 4: Simplify right side
   2,158.48x = 3,961,750.80
5. Step 5: Solve for x
   x = 3,961,750.80/2,158.48
6. Step 6: Final answer
   x = 1,835.44