Finding the Fourth Proportional to 1,191.04, 1,643.60 and 667.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.04 : 1,643.60 = 667.08 : x
2. Step 2: Convert to fraction form
   1,191.04/1,643.60 = 667.08/x
3. Step 3: Cross multiply
   1,191.04x = 1,643.60 × 667.08
4. Step 4: Simplify right side
   1,191.04x = 1,096,412.69
5. Step 5: Solve for x
   x = 1,096,412.69/1,191.04
6. Step 6: Final answer
   x = 920.55