Finding the Fourth Proportional to 1,100.48, 1,518.24 and 685.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.48 : 1,518.24 = 685.76 : x
2. Step 2: Convert to fraction form
   1,100.48/1,518.24 = 685.76/x
3. Step 3: Cross multiply
   1,100.48x = 1,518.24 × 685.76
4. Step 4: Simplify right side
   1,100.48x = 1,041,148.26
5. Step 5: Solve for x
   x = 1,041,148.26/1,100.48
6. Step 6: Final answer
   x = 946.09