Finding the Fourth Proportional to 1,387.28, 1,914.45 and 757.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.28 : 1,914.45 = 757.82 : x
2. Step 2: Convert to fraction form
   1,387.28/1,914.45 = 757.82/x
3. Step 3: Cross multiply
   1,387.28x = 1,914.45 × 757.82
4. Step 4: Simplify right side
   1,387.28x = 1,450,808.50
5. Step 5: Solve for x
   x = 1,450,808.50/1,387.28
6. Step 6: Final answer
   x = 1,045.79