Finding the Fourth Proportional to 1,983.96, 2,973.87 and 666.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.96 : 2,973.87 = 666.72 : x
2. Step 2: Convert to fraction form
   1,983.96/2,973.87 = 666.72/x
3. Step 3: Cross multiply
   1,983.96x = 2,973.87 × 666.72
4. Step 4: Simplify right side
   1,983.96x = 1,982,738.61
5. Step 5: Solve for x
   x = 1,982,738.61/1,983.96
6. Step 6: Final answer
   x = 999.38