Finding the Fourth Proportional to 1,191.30, 1,643.92 and 667.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.30 : 1,643.92 = 667.27 : x
2. Step 2: Convert to fraction form
   1,191.30/1,643.92 = 667.27/x
3. Step 3: Cross multiply
   1,191.30x = 1,643.92 × 667.27
4. Step 4: Simplify right side
   1,191.30x = 1,096,938.50
5. Step 5: Solve for x
   x = 1,096,938.50/1,191.30
6. Step 6: Final answer
   x = 920.79