Finding the Fourth Proportional to 3,870.42, 5,808.14 and 1,405.03

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.42 : 5,808.14 = 1,405.03 : x
2. Step 2: Convert to fraction form
   3,870.42/5,808.14 = 1,405.03/x
3. Step 3: Cross multiply
   3,870.42x = 5,808.14 × 1,405.03
4. Step 4: Simplify right side
   3,870.42x = 8,160,610.94
5. Step 5: Solve for x
   x = 8,160,610.94/3,870.42
6. Step 6: Final answer
   x = 2,108.46