Finding the Fourth Proportional to 1,290.27, 1,780.58 and 700.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.27 : 1,780.58 = 700.81 : x
2. Step 2: Convert to fraction form
   1,290.27/1,780.58 = 700.81/x
3. Step 3: Cross multiply
   1,290.27x = 1,780.58 × 700.81
4. Step 4: Simplify right side
   1,290.27x = 1,247,848.27
5. Step 5: Solve for x
   x = 1,247,848.27/1,290.27
6. Step 6: Final answer
   x = 967.12