Finding the Fourth Proportional to 3,931.99, 5,425.25 and 2,870.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.99 : 5,425.25 = 2,870.34 : x
2. Step 2: Convert to fraction form
   3,931.99/5,425.25 = 2,870.34/x
3. Step 3: Cross multiply
   3,931.99x = 5,425.25 × 2,870.34
4. Step 4: Simplify right side
   3,931.99x = 15,572,284.96
5. Step 5: Solve for x
   x = 15,572,284.96/3,931.99
6. Step 6: Final answer
   x = 3,960.41