Finding the Fourth Proportional to 2,564.94, 3,846.79 and 921.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,564.94 : 3,846.79 = 921.45 : x
2. Step 2: Convert to fraction form
   2,564.94/3,846.79 = 921.45/x
3. Step 3: Cross multiply
   2,564.94x = 3,846.79 × 921.45
4. Step 4: Simplify right side
   2,564.94x = 3,544,624.65
5. Step 5: Solve for x
   x = 3,544,624.65/2,564.94
6. Step 6: Final answer
   x = 1,381.95