Finding the Fourth Proportional to 3,870.75, 5,803.55 and 1,405.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.75 : 5,803.55 = 1,405.25 : x
2. Step 2: Convert to fraction form
   3,870.75/5,803.55 = 1,405.25/x
3. Step 3: Cross multiply
   3,870.75x = 5,803.55 × 1,405.25
4. Step 4: Simplify right side
   3,870.75x = 8,155,438.64
5. Step 5: Solve for x
   x = 8,155,438.64/3,870.75
6. Step 6: Final answer
   x = 2,106.94