Finding the Fourth Proportional to 1,980.30, 2,732.88 and 1,281.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.30 : 2,732.88 = 1,281.67 : x
2. Step 2: Convert to fraction form
   1,980.30/2,732.88 = 1,281.67/x
3. Step 3: Cross multiply
   1,980.30x = 2,732.88 × 1,281.67
4. Step 4: Simplify right side
   1,980.30x = 3,502,650.31
5. Step 5: Solve for x
   x = 3,502,650.31/1,980.30
6. Step 6: Final answer
   x = 1,768.75