Finding the Fourth Proportional to 2,874.76, 3,969.45 and 1,931.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,874.76 : 3,969.45 = 1,931.38 : x
2. Step 2: Convert to fraction form
   2,874.76/3,969.45 = 1,931.38/x
3. Step 3: Cross multiply
   2,874.76x = 3,969.45 × 1,931.38
4. Step 4: Simplify right side
   2,874.76x = 7,666,506.42
5. Step 5: Solve for x
   x = 7,666,506.42/2,874.76
6. Step 6: Final answer
   x = 2,666.84