Finding the Fourth Proportional to 21,421.27, 29,558.55 and 12,470.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,421.27 : 29,558.55 = 12,470.37 : x
2. Step 2: Convert to fraction form
   21,421.27/29,558.55 = 12,470.37/x
3. Step 3: Cross multiply
   21,421.27x = 29,558.55 × 12,470.37
4. Step 4: Simplify right side
   21,421.27x = 368,606,055.16
5. Step 5: Solve for x
   x = 368,606,055.16/21,421.27
6. Step 6: Final answer
   x = 17,207.48