Finding the Fourth Proportional to 1,386.35, 1,913.16 and 756.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.35 : 1,913.16 = 756.88 : x
2. Step 2: Convert to fraction form
   1,386.35/1,913.16 = 756.88/x
3. Step 3: Cross multiply
   1,386.35x = 1,913.16 × 756.88
4. Step 4: Simplify right side
   1,386.35x = 1,448,032.54
5. Step 5: Solve for x
   x = 1,448,032.54/1,386.35
6. Step 6: Final answer
   x = 1,044.49