Finding the Fourth Proportional to 5,139, 7,091.82 and 2,931

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139 : 7,091.82 = 2,931 : x
2. Step 2: Convert to fraction form
   5,139/7,091.82 = 2,931/x
3. Step 3: Cross multiply
   5,139x = 7,091.82 × 2,931
4. Step 4: Simplify right side
   5,139x = 20,786,124.42
5. Step 5: Solve for x
   x = 20,786,124.42/5,139
6. Step 6: Final answer
   x = 4,044.78