Finding the Fourth Proportional to 1,336.42, 1,843.85 and 776.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.42 : 1,843.85 = 776.78 : x
2. Step 2: Convert to fraction form
   1,336.42/1,843.85 = 776.78/x
3. Step 3: Cross multiply
   1,336.42x = 1,843.85 × 776.78
4. Step 4: Simplify right side
   1,336.42x = 1,432,265.80
5. Step 5: Solve for x
   x = 1,432,265.80/1,336.42
6. Step 6: Final answer
   x = 1,071.72