Finding the Fourth Proportional to 72,578.98, 108,840.48 and 28,199.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,578.98 : 108,840.48 = 28,199.89 : x
2. Step 2: Convert to fraction form
   72,578.98/108,840.48 = 28,199.89/x
3. Step 3: Cross multiply
   72,578.98x = 108,840.48 × 28,199.89
4. Step 4: Simplify right side
   72,578.98x = 3,069,289,563.55
5. Step 5: Solve for x
   x = 3,069,289,563.55/72,578.98
6. Step 6: Final answer
   x = 42,288.96