Finding the Fourth Proportional to 28,941.37, 43,421.47 and 13,144.55

Step by Step Solution

1. Step 1: Write the proportion equation
   28,941.37 : 43,421.47 = 13,144.55 : x
2. Step 2: Convert to fraction form
   28,941.37/43,421.47 = 13,144.55/x
3. Step 3: Cross multiply
   28,941.37x = 43,421.47 × 13,144.55
4. Step 4: Simplify right side
   28,941.37x = 570,755,433.52
5. Step 5: Solve for x
   x = 570,755,433.52/28,941.37
6. Step 6: Final answer
   x = 19,721.09