Finding the Fourth Proportional to 1,978.72, 2,730.16 and 1,279.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.72 : 2,730.16 = 1,279.96 : x
2. Step 2: Convert to fraction form
   1,978.72/2,730.16 = 1,279.96/x
3. Step 3: Cross multiply
   1,978.72x = 2,730.16 × 1,279.96
4. Step 4: Simplify right side
   1,978.72x = 3,494,495.59
5. Step 5: Solve for x
   x = 3,494,495.59/1,978.72
6. Step 6: Final answer
   x = 1,766.04