Finding the Fourth Proportional to 72,390.96, 99,898.56 and 40,560.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72,390.96 : 99,898.56 = 40,560.48 : x
2. Step 2: Convert to fraction form
   72,390.96/99,898.56 = 40,560.48/x
3. Step 3: Cross multiply
   72,390.96x = 99,898.56 × 40,560.48
4. Step 4: Simplify right side
   72,390.96x = 4,051,933,544.91
5. Step 5: Solve for x
   x = 4,051,933,544.91/72,390.96
6. Step 6: Final answer
   x = 55,972.92