Finding the Fourth Proportional to 1,387.17, 1,914.28 and 757.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.17 : 1,914.28 = 757.71 : x
2. Step 2: Convert to fraction form
   1,387.17/1,914.28 = 757.71/x
3. Step 3: Cross multiply
   1,387.17x = 1,914.28 × 757.71
4. Step 4: Simplify right side
   1,387.17x = 1,450,469.10
5. Step 5: Solve for x
   x = 1,450,469.10/1,387.17
6. Step 6: Final answer
   x = 1,045.63