Finding the Fourth Proportional to 2,559.91, 3,839.10 and 916.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.91 : 3,839.10 = 916.09 : x
2. Step 2: Convert to fraction form
   2,559.91/3,839.10 = 916.09/x
3. Step 3: Cross multiply
   2,559.91x = 3,839.10 × 916.09
4. Step 4: Simplify right side
   2,559.91x = 3,516,961.12
5. Step 5: Solve for x
   x = 3,516,961.12/2,559.91
6. Step 6: Final answer
   x = 1,373.86