Finding the Fourth Proportional to 3,871.71, 5,807.98 and 1,238.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.71 : 5,807.98 = 1,238.30 : x
2. Step 2: Convert to fraction form
   3,871.71/5,807.98 = 1,238.30/x
3. Step 3: Cross multiply
   3,871.71x = 5,807.98 × 1,238.30
4. Step 4: Simplify right side
   3,871.71x = 7,192,021.63
5. Step 5: Solve for x
   x = 7,192,021.63/3,871.71
6. Step 6: Final answer
   x = 1,857.58