Finding the Fourth Proportional to 2,781.30, 4,172.76 and 1,318.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,781.30 : 4,172.76 = 1,318.44 : x
2. Step 2: Convert to fraction form
   2,781.30/4,172.76 = 1,318.44/x
3. Step 3: Cross multiply
   2,781.30x = 4,172.76 × 1,318.44
4. Step 4: Simplify right side
   2,781.30x = 5,501,533.69
5. Step 5: Solve for x
   x = 5,501,533.69/2,781.30
6. Step 6: Final answer
   x = 1,978.04