Finding the Fourth Proportional to 1,387.08, 1,914.17 and 757.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.08 : 1,914.17 = 757.61 : x
2. Step 2: Convert to fraction form
   1,387.08/1,914.17 = 757.61/x
3. Step 3: Cross multiply
   1,387.08x = 1,914.17 × 757.61
4. Step 4: Simplify right side
   1,387.08x = 1,450,194.33
5. Step 5: Solve for x
   x = 1,450,194.33/1,387.08
6. Step 6: Final answer
   x = 1,045.50