Finding the Fourth Proportional to 2,128.14, 3,191.94 and 667.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.14 : 3,191.94 = 667.17 : x
2. Step 2: Convert to fraction form
   2,128.14/3,191.94 = 667.17/x
3. Step 3: Cross multiply
   2,128.14x = 3,191.94 × 667.17
4. Step 4: Simplify right side
   2,128.14x = 2,129,566.61
5. Step 5: Solve for x
   x = 2,129,566.61/2,128.14
6. Step 6: Final answer
   x = 1,000.67