Finding the Fourth Proportional to 1,330.82, 1,836.72 and 771.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,330.82 : 1,836.72 = 771.30 : x
2. Step 2: Convert to fraction form
   1,330.82/1,836.72 = 771.30/x
3. Step 3: Cross multiply
   1,330.82x = 1,836.72 × 771.30
4. Step 4: Simplify right side
   1,330.82x = 1,416,662.14
5. Step 5: Solve for x
   x = 1,416,662.14/1,330.82
6. Step 6: Final answer
   x = 1,064.51