Finding the Fourth Proportional to 1,947.91, 2,688.10 and 1,201.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.91 : 2,688.10 = 1,201.57 : x
2. Step 2: Convert to fraction form
   1,947.91/2,688.10 = 1,201.57/x
3. Step 3: Cross multiply
   1,947.91x = 2,688.10 × 1,201.57
4. Step 4: Simplify right side
   1,947.91x = 3,229,940.32
5. Step 5: Solve for x
   x = 3,229,940.32/1,947.91
6. Step 6: Final answer
   x = 1,658.16