Finding the Fourth Proportional to 72,450.42, 99,981.75 and 40,187.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,450.42 : 99,981.75 = 40,187.31 : x
2. Step 2: Convert to fraction form
   72,450.42/99,981.75 = 40,187.31/x
3. Step 3: Cross multiply
   72,450.42x = 99,981.75 × 40,187.31
4. Step 4: Simplify right side
   72,450.42x = 4,017,997,581.59
5. Step 5: Solve for x
   x = 4,017,997,581.59/72,450.42
6. Step 6: Final answer
   x = 55,458.58