Finding the Fourth Proportional to 1,947.78, 2,688.71 and 1,318

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.78 : 2,688.71 = 1,318 : x
2. Step 2: Convert to fraction form
   1,947.78/2,688.71 = 1,318/x
3. Step 3: Cross multiply
   1,947.78x = 2,688.71 × 1,318
4. Step 4: Simplify right side
   1,947.78x = 3,543,719.78
5. Step 5: Solve for x
   x = 3,543,719.78/1,947.78
6. Step 6: Final answer
   x = 1,819.36