Finding the Fourth Proportional to 10,355.27, 14,290.29 and 5,639.45

Step by Step Solution

1. Step 1: Write the proportion equation
   10,355.27 : 14,290.29 = 5,639.45 : x
2. Step 2: Convert to fraction form
   10,355.27/14,290.29 = 5,639.45/x
3. Step 3: Cross multiply
   10,355.27x = 14,290.29 × 5,639.45
4. Step 4: Simplify right side
   10,355.27x = 80,589,304.49
5. Step 5: Solve for x
   x = 80,589,304.49/10,355.27
6. Step 6: Final answer
   x = 7,782.45