Finding the Fourth Proportional to 1,335.05, 2,003.31 and 718.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.05 : 2,003.31 = 718.71 : x
2. Step 2: Convert to fraction form
   1,335.05/2,003.31 = 718.71/x
3. Step 3: Cross multiply
   1,335.05x = 2,003.31 × 718.71
4. Step 4: Simplify right side
   1,335.05x = 1,439,798.93
5. Step 5: Solve for x
   x = 1,439,798.93/1,335.05
6. Step 6: Final answer
   x = 1,078.46