Finding the Fourth Proportional to 2,874.70, 3,968.67 and 1,931.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,874.70 : 3,968.67 = 1,931.86 : x
2. Step 2: Convert to fraction form
   2,874.70/3,968.67 = 1,931.86/x
3. Step 3: Cross multiply
   2,874.70x = 3,968.67 × 1,931.86
4. Step 4: Simplify right side
   2,874.70x = 7,666,914.83
5. Step 5: Solve for x
   x = 7,666,914.83/2,874.70
6. Step 6: Final answer
   x = 2,667.03