Finding the Fourth Proportional to 28,519, 42,796.32 and 13,729.48

Step by Step Solution

1. Step 1: Write the proportion equation
   28,519 : 42,796.32 = 13,729.48 : x
2. Step 2: Convert to fraction form
   28,519/42,796.32 = 13,729.48/x
3. Step 3: Cross multiply
   28,519x = 42,796.32 × 13,729.48
4. Step 4: Simplify right side
   28,519x = 587,571,219.51
5. Step 5: Solve for x
   x = 587,571,219.51/28,519
6. Step 6: Final answer
   x = 20,602.80