Finding the Fourth Proportional to 1,330.21, 1,835.71 and 770.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,330.21 : 1,835.71 = 770.72 : x
2. Step 2: Convert to fraction form
   1,330.21/1,835.71 = 770.72/x
3. Step 3: Cross multiply
   1,330.21x = 1,835.71 × 770.72
4. Step 4: Simplify right side
   1,330.21x = 1,414,818.41
5. Step 5: Solve for x
   x = 1,414,818.41/1,330.21
6. Step 6: Final answer
   x = 1,063.61