Finding the Fourth Proportional to 1,983.57, 2,974.37 and 666.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.57 : 2,974.37 = 666.78 : x
2. Step 2: Convert to fraction form
   1,983.57/2,974.37 = 666.78/x
3. Step 3: Cross multiply
   1,983.57x = 2,974.37 × 666.78
4. Step 4: Simplify right side
   1,983.57x = 1,983,247.09
5. Step 5: Solve for x
   x = 1,983,247.09/1,983.57
6. Step 6: Final answer
   x = 999.84