Finding the Fourth Proportional to 2,231.67, 3,079.01 and 1,287.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.67 : 3,079.01 = 1,287.34 : x
2. Step 2: Convert to fraction form
   2,231.67/3,079.01 = 1,287.34/x
3. Step 3: Cross multiply
   2,231.67x = 3,079.01 × 1,287.34
4. Step 4: Simplify right side
   2,231.67x = 3,963,732.58
5. Step 5: Solve for x
   x = 3,963,732.58/2,231.67
6. Step 6: Final answer
   x = 1,776.13