Finding the Fourth Proportional to 1,335.89, 1,843.53 and 776.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.89 : 1,843.53 = 776.39 : x
2. Step 2: Convert to fraction form
   1,335.89/1,843.53 = 776.39/x
3. Step 3: Cross multiply
   1,335.89x = 1,843.53 × 776.39
4. Step 4: Simplify right side
   1,335.89x = 1,431,286.13
5. Step 5: Solve for x
   x = 1,431,286.13/1,335.89
6. Step 6: Final answer
   x = 1,071.41