Finding the Fourth Proportional to 3,870.37, 5,802.58 and 1,921.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.37 : 5,802.58 = 1,921.06 : x
2. Step 2: Convert to fraction form
   3,870.37/5,802.58 = 1,921.06/x
3. Step 3: Cross multiply
   3,870.37x = 5,802.58 × 1,921.06
4. Step 4: Simplify right side
   3,870.37x = 11,147,104.33
5. Step 5: Solve for x
   x = 11,147,104.33/3,870.37
6. Step 6: Final answer
   x = 2,880.11