Finding the Fourth Proportional to 2,309.10, 3,462.43 and 921.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.10 : 3,462.43 = 921.30 : x
2. Step 2: Convert to fraction form
   2,309.10/3,462.43 = 921.30/x
3. Step 3: Cross multiply
   2,309.10x = 3,462.43 × 921.30
4. Step 4: Simplify right side
   2,309.10x = 3,189,936.76
5. Step 5: Solve for x
   x = 3,189,936.76/2,309.10
6. Step 6: Final answer
   x = 1,381.46