Finding the Fourth Proportional to 23,421.23, 32,321.78 and 12,811.55

Step by Step Solution

1. Step 1: Write the proportion equation
   23,421.23 : 32,321.78 = 12,811.55 : x
2. Step 2: Convert to fraction form
   23,421.23/32,321.78 = 12,811.55/x
3. Step 3: Cross multiply
   23,421.23x = 32,321.78 × 12,811.55
4. Step 4: Simplify right side
   23,421.23x = 414,092,100.56
5. Step 5: Solve for x
   x = 414,092,100.56/23,421.23
6. Step 6: Final answer
   x = 17,680.20