Finding the Fourth Proportional to 3,916.88, 5,405.34 and 2,238.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,916.88 : 5,405.34 = 2,238.52 : x
2. Step 2: Convert to fraction form
   3,916.88/5,405.34 = 2,238.52/x
3. Step 3: Cross multiply
   3,916.88x = 5,405.34 × 2,238.52
4. Step 4: Simplify right side
   3,916.88x = 12,099,961.70
5. Step 5: Solve for x
   x = 12,099,961.70/3,916.88
6. Step 6: Final answer
   x = 3,089.18