Finding the Fourth Proportional to 1,965.39, 2,947.81 and 666.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,965.39 : 2,947.81 = 666.69 : x
2. Step 2: Convert to fraction form
   1,965.39/2,947.81 = 666.69/x
3. Step 3: Cross multiply
   1,965.39x = 2,947.81 × 666.69
4. Step 4: Simplify right side
   1,965.39x = 1,965,275.45
5. Step 5: Solve for x
   x = 1,965,275.45/1,965.39
6. Step 6: Final answer
   x = 999.94