Finding the Fourth Proportional to 20,485.87, 30,738.86 and 7,339.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,485.87 : 30,738.86 = 7,339.30 : x
2. Step 2: Convert to fraction form
   20,485.87/30,738.86 = 7,339.30/x
3. Step 3: Cross multiply
   20,485.87x = 30,738.86 × 7,339.30
4. Step 4: Simplify right side
   20,485.87x = 225,601,733.55
5. Step 5: Solve for x
   x = 225,601,733.55/20,485.87
6. Step 6: Final answer
   x = 11,012.55