Finding the Fourth Proportional to 3,870.94, 5,803.71 and 1,921.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.94 : 5,803.71 = 1,921.81 : x
2. Step 2: Convert to fraction form
   3,870.94/5,803.71 = 1,921.81/x
3. Step 3: Cross multiply
   3,870.94x = 5,803.71 × 1,921.81
4. Step 4: Simplify right side
   3,870.94x = 11,153,627.92
5. Step 5: Solve for x
   x = 11,153,627.92/3,870.94
6. Step 6: Final answer
   x = 2,881.37