Finding the Fourth Proportional to 11,085.90, 16,623.30 and 3,687.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,085.90 : 16,623.30 = 3,687.78 : x
2. Step 2: Convert to fraction form
   11,085.90/16,623.30 = 3,687.78/x
3. Step 3: Cross multiply
   11,085.90x = 16,623.30 × 3,687.78
4. Step 4: Simplify right side
   11,085.90x = 61,303,073.27
5. Step 5: Solve for x
   x = 61,303,073.27/11,085.90
6. Step 6: Final answer
   x = 5,529.82