Finding the Fourth Proportional to 1,164.47, 1,606.91 and 667.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.47 : 1,606.91 = 667.11 : x
2. Step 2: Convert to fraction form
   1,164.47/1,606.91 = 667.11/x
3. Step 3: Cross multiply
   1,164.47x = 1,606.91 × 667.11
4. Step 4: Simplify right side
   1,164.47x = 1,071,982.39
5. Step 5: Solve for x
   x = 1,071,982.39/1,164.47
6. Step 6: Final answer
   x = 920.58