Finding the Fourth Proportional to 1,980.18, 2,733.57 and 1,281.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.18 : 2,733.57 = 1,281.78 : x
2. Step 2: Convert to fraction form
   1,980.18/2,733.57 = 1,281.78/x
3. Step 3: Cross multiply
   1,980.18x = 2,733.57 × 1,281.78
4. Step 4: Simplify right side
   1,980.18x = 3,503,835.35
5. Step 5: Solve for x
   x = 3,503,835.35/1,980.18
6. Step 6: Final answer
   x = 1,769.45