Finding the Fourth Proportional to 1,095.76, 1,640.76 and 748.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,095.76 : 1,640.76 = 748.28 : x
2. Step 2: Convert to fraction form
   1,095.76/1,640.76 = 748.28/x
3. Step 3: Cross multiply
   1,095.76x = 1,640.76 × 748.28
4. Step 4: Simplify right side
   1,095.76x = 1,227,747.89
5. Step 5: Solve for x
   x = 1,227,747.89/1,095.76
6. Step 6: Final answer
   x = 1,120.45