Finding the Fourth Proportional to 1,191.41, 1,644.05 and 667.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.41 : 1,644.05 = 667.34 : x
2. Step 2: Convert to fraction form
   1,191.41/1,644.05 = 667.34/x
3. Step 3: Cross multiply
   1,191.41x = 1,644.05 × 667.34
4. Step 4: Simplify right side
   1,191.41x = 1,097,128.77
5. Step 5: Solve for x
   x = 1,097,128.77/1,191.41
6. Step 6: Final answer
   x = 920.87