Finding the Fourth Proportional to 2,560.32, 3,839.46 and 916.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.32 : 3,839.46 = 916.56 : x
2. Step 2: Convert to fraction form
   2,560.32/3,839.46 = 916.56/x
3. Step 3: Cross multiply
   2,560.32x = 3,839.46 × 916.56
4. Step 4: Simplify right side
   2,560.32x = 3,519,095.46
5. Step 5: Solve for x
   x = 3,519,095.46/2,560.32
6. Step 6: Final answer
   x = 1,374.47