Finding the Fourth Proportional to 1,938.91, 2,674.34 and 1,191.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,938.91 : 2,674.34 = 1,191.89 : x
2. Step 2: Convert to fraction form
   1,938.91/2,674.34 = 1,191.89/x
3. Step 3: Cross multiply
   1,938.91x = 2,674.34 × 1,191.89
4. Step 4: Simplify right side
   1,938.91x = 3,187,514.27
5. Step 5: Solve for x
   x = 3,187,514.27/1,938.91
6. Step 6: Final answer
   x = 1,643.97