Finding the Fourth Proportional to 22,760.86, 31,409.38 and 13,200.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,760.86 : 31,409.38 = 13,200.15 : x
2. Step 2: Convert to fraction form
   22,760.86/31,409.38 = 13,200.15/x
3. Step 3: Cross multiply
   22,760.86x = 31,409.38 × 13,200.15
4. Step 4: Simplify right side
   22,760.86x = 414,608,494.41
5. Step 5: Solve for x
   x = 414,608,494.41/22,760.86
6. Step 6: Final answer
   x = 18,215.86