Finding the Fourth Proportional to 10,662.76, 15,990.51 and 3,640.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,662.76 : 15,990.51 = 3,640.06 : x
2. Step 2: Convert to fraction form
   10,662.76/15,990.51 = 3,640.06/x
3. Step 3: Cross multiply
   10,662.76x = 15,990.51 × 3,640.06
4. Step 4: Simplify right side
   10,662.76x = 58,206,415.83
5. Step 5: Solve for x
   x = 58,206,415.83/10,662.76
6. Step 6: Final answer
   x = 5,458.85