Finding the Fourth Proportional to 28,323.34, 42,420.38 and 13,542.71

Step by Step Solution

1. Step 1: Write the proportion equation
   28,323.34 : 42,420.38 = 13,542.71 : x
2. Step 2: Convert to fraction form
   28,323.34/42,420.38 = 13,542.71/x
3. Step 3: Cross multiply
   28,323.34x = 42,420.38 × 13,542.71
4. Step 4: Simplify right side
   28,323.34x = 574,487,044.34
5. Step 5: Solve for x
   x = 574,487,044.34/28,323.34
6. Step 6: Final answer
   x = 20,283.17