Finding the Fourth Proportional to 1,978.89, 2,733.03 and 1,318.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.89 : 2,733.03 = 1,318.55 : x
2. Step 2: Convert to fraction form
   1,978.89/2,733.03 = 1,318.55/x
3. Step 3: Cross multiply
   1,978.89x = 2,733.03 × 1,318.55
4. Step 4: Simplify right side
   1,978.89x = 3,603,623.04
5. Step 5: Solve for x
   x = 3,603,623.04/1,978.89
6. Step 6: Final answer
   x = 1,821.03