Finding the Fourth Proportional to 1,335.74, 1,843.72 and 776.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.74 : 1,843.72 = 776.34 : x
2. Step 2: Convert to fraction form
   1,335.74/1,843.72 = 776.34/x
3. Step 3: Cross multiply
   1,335.74x = 1,843.72 × 776.34
4. Step 4: Simplify right side
   1,335.74x = 1,431,353.58
5. Step 5: Solve for x
   x = 1,431,353.58/1,335.74
6. Step 6: Final answer
   x = 1,071.58