Finding the Fourth Proportional to 72,047.76, 99,416.72 and 40,218

Step by Step Solution

1. Step 1: Write the proportion equation
   72,047.76 : 99,416.72 = 40,218 : x
2. Step 2: Convert to fraction form
   72,047.76/99,416.72 = 40,218/x
3. Step 3: Cross multiply
   72,047.76x = 99,416.72 × 40,218
4. Step 4: Simplify right side
   72,047.76x = 3,998,341,644.96
5. Step 5: Solve for x
   x = 3,998,341,644.96/72,047.76
6. Step 6: Final answer
   x = 55,495.71