Finding the Fourth Proportional to 11,870.10, 17,805.30 and 3,105

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.10 : 17,805.30 = 3,105 : x
2. Step 2: Convert to fraction form
   11,870.10/17,805.30 = 3,105/x
3. Step 3: Cross multiply
   11,870.10x = 17,805.30 × 3,105
4. Step 4: Simplify right side
   11,870.10x = 55,285,456.50
5. Step 5: Solve for x
   x = 55,285,456.50/11,870.10
6. Step 6: Final answer
   x = 4,657.54