Finding the Fourth Proportional to 3,913.72, 5,870.94 and 1,281.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.72 : 5,870.94 = 1,281.24 : x
2. Step 2: Convert to fraction form
   3,913.72/5,870.94 = 1,281.24/x
3. Step 3: Cross multiply
   3,913.72x = 5,870.94 × 1,281.24
4. Step 4: Simplify right side
   3,913.72x = 7,522,083.17
5. Step 5: Solve for x
   x = 7,522,083.17/3,913.72
6. Step 6: Final answer
   x = 1,921.98