Finding the Fourth Proportional to 1,387.27, 1,914.42 and 757.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.27 : 1,914.42 = 757.81 : x
2. Step 2: Convert to fraction form
   1,387.27/1,914.42 = 757.81/x
3. Step 3: Cross multiply
   1,387.27x = 1,914.42 × 757.81
4. Step 4: Simplify right side
   1,387.27x = 1,450,766.62
5. Step 5: Solve for x
   x = 1,450,766.62/1,387.27
6. Step 6: Final answer
   x = 1,045.77