Finding the Fourth Proportional to 1,966.72, 2,949.60 and 1,321.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,966.72 : 2,949.60 = 1,321.36 : x
2. Step 2: Convert to fraction form
   1,966.72/2,949.60 = 1,321.36/x
3. Step 3: Cross multiply
   1,966.72x = 2,949.60 × 1,321.36
4. Step 4: Simplify right side
   1,966.72x = 3,897,483.46
5. Step 5: Solve for x
   x = 3,897,483.46/1,966.72
6. Step 6: Final answer
   x = 1,981.72