Finding the Fourth Proportional to 3,912.42, 5,870.54 and 1,720.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.42 : 5,870.54 = 1,720.87 : x
2. Step 2: Convert to fraction form
   3,912.42/5,870.54 = 1,720.87/x
3. Step 3: Cross multiply
   3,912.42x = 5,870.54 × 1,720.87
4. Step 4: Simplify right side
   3,912.42x = 10,102,436.17
5. Step 5: Solve for x
   x = 10,102,436.17/3,912.42
6. Step 6: Final answer
   x = 2,582.15