Finding the Fourth Proportional to 28,449.31, 42,660.33 and 13,443.94

Step by Step Solution

1. Step 1: Write the proportion equation
   28,449.31 : 42,660.33 = 13,443.94 : x
2. Step 2: Convert to fraction form
   28,449.31/42,660.33 = 13,443.94/x
3. Step 3: Cross multiply
   28,449.31x = 42,660.33 × 13,443.94
4. Step 4: Simplify right side
   28,449.31x = 573,522,776.64
5. Step 5: Solve for x
   x = 573,522,776.64/28,449.31
6. Step 6: Final answer
   x = 20,159.46