Finding the Fourth Proportional to 1,131.78, 1,695.56 and 668.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.78 : 1,695.56 = 668.18 : x
2. Step 2: Convert to fraction form
   1,131.78/1,695.56 = 668.18/x
3. Step 3: Cross multiply
   1,131.78x = 1,695.56 × 668.18
4. Step 4: Simplify right side
   1,131.78x = 1,132,927.46
5. Step 5: Solve for x
   x = 1,132,927.46/1,131.78
6. Step 6: Final answer
   x = 1,001.01