Finding the Fourth Proportional to 3,913.89, 5,870.21 and 1,281.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.89 : 5,870.21 = 1,281.37 : x
2. Step 2: Convert to fraction form
   3,913.89/5,870.21 = 1,281.37/x
3. Step 3: Cross multiply
   3,913.89x = 5,870.21 × 1,281.37
4. Step 4: Simplify right side
   3,913.89x = 7,521,875.23
5. Step 5: Solve for x
   x = 7,521,875.23/3,913.89
6. Step 6: Final answer
   x = 1,921.84