Finding the Fourth Proportional to 72,253.19, 99,715.38 and 40,425.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,253.19 : 99,715.38 = 40,425.05 : x
2. Step 2: Convert to fraction form
   72,253.19/99,715.38 = 40,425.05/x
3. Step 3: Cross multiply
   72,253.19x = 99,715.38 × 40,425.05
4. Step 4: Simplify right side
   72,253.19x = 4,030,999,222.27
5. Step 5: Solve for x
   x = 4,030,999,222.27/72,253.19
6. Step 6: Final answer
   x = 55,789.91