Finding the Fourth Proportional to 28,238.56, 42,330.29 and 13,443.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,238.56 : 42,330.29 = 13,443.50 : x
2. Step 2: Convert to fraction form
   28,238.56/42,330.29 = 13,443.50/x
3. Step 3: Cross multiply
   28,238.56x = 42,330.29 × 13,443.50
4. Step 4: Simplify right side
   28,238.56x = 569,067,292.22
5. Step 5: Solve for x
   x = 569,067,292.22/28,238.56
6. Step 6: Final answer
   x = 20,152.14