Finding the Fourth Proportional to 1,946.78, 2,686.56 and 1,248.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,946.78 : 2,686.56 = 1,248.16 : x
2. Step 2: Convert to fraction form
   1,946.78/2,686.56 = 1,248.16/x
3. Step 3: Cross multiply
   1,946.78x = 2,686.56 × 1,248.16
4. Step 4: Simplify right side
   1,946.78x = 3,353,243.30
5. Step 5: Solve for x
   x = 3,353,243.30/1,946.78
6. Step 6: Final answer
   x = 1,722.46