Finding the Fourth Proportional to 1,378.76, 1,902.72 and 757.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.76 : 1,902.72 = 757.76 : x
2. Step 2: Convert to fraction form
   1,378.76/1,902.72 = 757.76/x
3. Step 3: Cross multiply
   1,378.76x = 1,902.72 × 757.76
4. Step 4: Simplify right side
   1,378.76x = 1,441,805.11
5. Step 5: Solve for x
   x = 1,441,805.11/1,378.76
6. Step 6: Final answer
   x = 1,045.73