Finding the Fourth Proportional to 1,199.07, 1,654.72 and 667.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,199.07 : 1,654.72 = 667.96 : x
2. Step 2: Convert to fraction form
   1,199.07/1,654.72 = 667.96/x
3. Step 3: Cross multiply
   1,199.07x = 1,654.72 × 667.96
4. Step 4: Simplify right side
   1,199.07x = 1,105,280.96
5. Step 5: Solve for x
   x = 1,105,280.96/1,199.07
6. Step 6: Final answer
   x = 921.78