Finding the Fourth Proportional to 28,271.43, 42,342.55 and 13,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,271.43 : 42,342.55 = 13,490.72 : x
2. Step 2: Convert to fraction form
   28,271.43/42,342.55 = 13,490.72/x
3. Step 3: Cross multiply
   28,271.43x = 42,342.55 × 13,490.72
4. Step 4: Simplify right side
   28,271.43x = 571,231,665.46
5. Step 5: Solve for x
   x = 571,231,665.46/28,271.43
6. Step 6: Final answer
   x = 20,205.26