Finding the Fourth Proportional to 1,989.84, 2,978.61 and 1,819.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.84 : 2,978.61 = 1,819.74 : x
2. Step 2: Convert to fraction form
   1,989.84/2,978.61 = 1,819.74/x
3. Step 3: Cross multiply
   1,989.84x = 2,978.61 × 1,819.74
4. Step 4: Simplify right side
   1,989.84x = 5,420,300.11
5. Step 5: Solve for x
   x = 5,420,300.11/1,989.84
6. Step 6: Final answer
   x = 2,723.98