Finding the Fourth Proportional to 10,355.25, 14,290.35 and 5,639.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,355.25 : 14,290.35 = 5,639.55 : x
2. Step 2: Convert to fraction form
   10,355.25/14,290.35 = 5,639.55/x
3. Step 3: Cross multiply
   10,355.25x = 14,290.35 × 5,639.55
4. Step 4: Simplify right side
   10,355.25x = 80,591,143.34
5. Step 5: Solve for x
   x = 80,591,143.34/10,355.25
6. Step 6: Final answer
   x = 7,782.64