Finding the Fourth Proportional to 28,238.64, 42,330.42 and 13,443.59

Step by Step Solution

1. Step 1: Write the proportion equation
   28,238.64 : 42,330.42 = 13,443.59 : x
2. Step 2: Convert to fraction form
   28,238.64/42,330.42 = 13,443.59/x
3. Step 3: Cross multiply
   28,238.64x = 42,330.42 × 13,443.59
4. Step 4: Simplify right side
   28,238.64x = 569,072,599.36
5. Step 5: Solve for x
   x = 569,072,599.36/28,238.64
6. Step 6: Final answer
   x = 20,152.27