Finding the Fourth Proportional to 2,256.10, 3,381.53 and 939.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,256.10 : 3,381.53 = 939.12 : x
2. Step 2: Convert to fraction form
   2,256.10/3,381.53 = 939.12/x
3. Step 3: Cross multiply
   2,256.10x = 3,381.53 × 939.12
4. Step 4: Simplify right side
   2,256.10x = 3,175,663.83
5. Step 5: Solve for x
   x = 3,175,663.83/2,256.10
6. Step 6: Final answer
   x = 1,407.59