Finding the Fourth Proportional to 72,361.27, 99,859.60 and 42,145.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,361.27 : 99,859.60 = 42,145.80 : x
2. Step 2: Convert to fraction form
   72,361.27/99,859.60 = 42,145.80/x
3. Step 3: Cross multiply
   72,361.27x = 99,859.60 × 42,145.80
4. Step 4: Simplify right side
   72,361.27x = 4,208,662,729.68
5. Step 5: Solve for x
   x = 4,208,662,729.68/72,361.27
6. Step 6: Final answer
   x = 58,161.81