Finding the Fourth Proportional to 72,200.72, 99,636.72 and 40,369.52

Step by Step Solution

1. Step 1: Write the proportion equation
   72,200.72 : 99,636.72 = 40,369.52 : x
2. Step 2: Convert to fraction form
   72,200.72/99,636.72 = 40,369.52/x
3. Step 3: Cross multiply
   72,200.72x = 99,636.72 × 40,369.52
4. Step 4: Simplify right side
   72,200.72x = 4,022,286,560.77
5. Step 5: Solve for x
   x = 4,022,286,560.77/72,200.72
6. Step 6: Final answer
   x = 55,709.78