Finding the Fourth Proportional to 667.89, 921.69 and 435.42

Step by Step Solution

1. Step 1: Write the proportion equation
   667.89 : 921.69 = 435.42 : x
2. Step 2: Convert to fraction form
   667.89/921.69 = 435.42/x
3. Step 3: Cross multiply
   667.89x = 921.69 × 435.42
4. Step 4: Simplify right side
   667.89x = 401,322.26
5. Step 5: Solve for x
   x = 401,322.26/667.89
6. Step 6: Final answer
   x = 600.88