Finding the Fourth Proportional to 1,165.76, 1,608.78 and 668.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.76 : 1,608.78 = 668.51 : x
2. Step 2: Convert to fraction form
   1,165.76/1,608.78 = 668.51/x
3. Step 3: Cross multiply
   1,165.76x = 1,608.78 × 668.51
4. Step 4: Simplify right side
   1,165.76x = 1,075,485.52
5. Step 5: Solve for x
   x = 1,075,485.52/1,165.76
6. Step 6: Final answer
   x = 922.56