Finding the Fourth Proportional to 72,223.05, 99,667.73 and 40,391.95

Step by Step Solution

1. Step 1: Write the proportion equation
   72,223.05 : 99,667.73 = 40,391.95 : x
2. Step 2: Convert to fraction form
   72,223.05/99,667.73 = 40,391.95/x
3. Step 3: Cross multiply
   72,223.05x = 99,667.73 × 40,391.95
4. Step 4: Simplify right side
   72,223.05x = 4,025,773,966.77
5. Step 5: Solve for x
   x = 4,025,773,966.77/72,223.05
6. Step 6: Final answer
   x = 55,740.85