Finding the Fourth Proportional to 1,387.33, 1,914.56 and 757.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.33 : 1,914.56 = 757.89 : x
2. Step 2: Convert to fraction form
   1,387.33/1,914.56 = 757.89/x
3. Step 3: Cross multiply
   1,387.33x = 1,914.56 × 757.89
4. Step 4: Simplify right side
   1,387.33x = 1,451,022.09
5. Step 5: Solve for x
   x = 1,451,022.09/1,387.33
6. Step 6: Final answer
   x = 1,045.91