Finding the Fourth Proportional to 2,131.18, 3,194.70 and 1,091.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.18 : 3,194.70 = 1,091.67 : x
2. Step 2: Convert to fraction form
   2,131.18/3,194.70 = 1,091.67/x
3. Step 3: Cross multiply
   2,131.18x = 3,194.70 × 1,091.67
4. Step 4: Simplify right side
   2,131.18x = 3,487,558.15
5. Step 5: Solve for x
   x = 3,487,558.15/2,131.18
6. Step 6: Final answer
   x = 1,636.45