Finding the Fourth Proportional to 3,105.17, 4,656.15 and 913.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,105.17 : 4,656.15 = 913.61 : x
2. Step 2: Convert to fraction form
   3,105.17/4,656.15 = 913.61/x
3. Step 3: Cross multiply
   3,105.17x = 4,656.15 × 913.61
4. Step 4: Simplify right side
   3,105.17x = 4,253,916.84
5. Step 5: Solve for x
   x = 4,253,916.84/3,105.17
6. Step 6: Final answer
   x = 1,369.95