Finding the Fourth Proportional to 1,164.89, 1,607.77 and 667.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.89 : 1,607.77 = 667.86 : x
2. Step 2: Convert to fraction form
   1,164.89/1,607.77 = 667.86/x
3. Step 3: Cross multiply
   1,164.89x = 1,607.77 × 667.86
4. Step 4: Simplify right side
   1,164.89x = 1,073,765.27
5. Step 5: Solve for x
   x = 1,073,765.27/1,164.89
6. Step 6: Final answer
   x = 921.78