Finding the Fourth Proportional to 1,310.42, 1,808.28 and 720.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,310.42 : 1,808.28 = 720.83 : x
2. Step 2: Convert to fraction form
   1,310.42/1,808.28 = 720.83/x
3. Step 3: Cross multiply
   1,310.42x = 1,808.28 × 720.83
4. Step 4: Simplify right side
   1,310.42x = 1,303,453.43
5. Step 5: Solve for x
   x = 1,303,453.43/1,310.42
6. Step 6: Final answer
   x = 994.69