Finding the Fourth Proportional to 1,386.57, 1,913.45 and 757.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.57 : 1,913.45 = 757.10 : x
2. Step 2: Convert to fraction form
   1,386.57/1,913.45 = 757.10/x
3. Step 3: Cross multiply
   1,386.57x = 1,913.45 × 757.10
4. Step 4: Simplify right side
   1,386.57x = 1,448,667.11
5. Step 5: Solve for x
   x = 1,448,667.11/1,386.57
6. Step 6: Final answer
   x = 1,044.78