Finding the Fourth Proportional to 22,391.50, 30,900.30 and 12,455.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,391.50 : 30,900.30 = 12,455.50 : x
2. Step 2: Convert to fraction form
   22,391.50/30,900.30 = 12,455.50/x
3. Step 3: Cross multiply
   22,391.50x = 30,900.30 × 12,455.50
4. Step 4: Simplify right side
   22,391.50x = 384,878,686.65
5. Step 5: Solve for x
   x = 384,878,686.65/22,391.50
6. Step 6: Final answer
   x = 17,188.61