Finding the Fourth Proportional to 1,979.30, 2,731.50 and 1,280.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,979.30 : 2,731.50 = 1,280.67 : x
2. Step 2: Convert to fraction form
   1,979.30/2,731.50 = 1,280.67/x
3. Step 3: Cross multiply
   1,979.30x = 2,731.50 × 1,280.67
4. Step 4: Simplify right side
   1,979.30x = 3,498,150.11
5. Step 5: Solve for x
   x = 3,498,150.11/1,979.30
6. Step 6: Final answer
   x = 1,767.37