Finding the Fourth Proportional to 1,164.79, 1,607.49 and 667.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.79 : 1,607.49 = 667.60 : x
2. Step 2: Convert to fraction form
   1,164.79/1,607.49 = 667.60/x
3. Step 3: Cross multiply
   1,164.79x = 1,607.49 × 667.60
4. Step 4: Simplify right side
   1,164.79x = 1,073,160.32
5. Step 5: Solve for x
   x = 1,073,160.32/1,164.79
6. Step 6: Final answer
   x = 921.33