Finding the Fourth Proportional to 28,359.72, 42,474.72 and 13,579.08

Step by Step Solution

1. Step 1: Write the proportion equation
   28,359.72 : 42,474.72 = 13,579.08 : x
2. Step 2: Convert to fraction form
   28,359.72/42,474.72 = 13,579.08/x
3. Step 3: Cross multiply
   28,359.72x = 42,474.72 × 13,579.08
4. Step 4: Simplify right side
   28,359.72x = 576,767,620.86
5. Step 5: Solve for x
   x = 576,767,620.86/28,359.72
6. Step 6: Final answer
   x = 20,337.56