Finding the Fourth Proportional to 1,621.94, 2,238.28 and 923.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.94 : 2,238.28 = 923.31 : x
2. Step 2: Convert to fraction form
   1,621.94/2,238.28 = 923.31/x
3. Step 3: Cross multiply
   1,621.94x = 2,238.28 × 923.31
4. Step 4: Simplify right side
   1,621.94x = 2,066,628.44
5. Step 5: Solve for x
   x = 2,066,628.44/1,621.94
6. Step 6: Final answer
   x = 1,274.17