Finding the Fourth Proportional to 9,105.70, 13,660.61 and 2,781.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,105.70 : 13,660.61 = 2,781.15 : x
2. Step 2: Convert to fraction form
   9,105.70/13,660.61 = 2,781.15/x
3. Step 3: Cross multiply
   9,105.70x = 13,660.61 × 2,781.15
4. Step 4: Simplify right side
   9,105.70x = 37,992,123.29
5. Step 5: Solve for x
   x = 37,992,123.29/9,105.70
6. Step 6: Final answer
   x = 4,172.35