Finding the Fourth Proportional to 72,249.79, 99,731.46 and 54,396.58

Step by Step Solution

1. Step 1: Write the proportion equation
   72,249.79 : 99,731.46 = 54,396.58 : x
2. Step 2: Convert to fraction form
   72,249.79/99,731.46 = 54,396.58/x
3. Step 3: Cross multiply
   72,249.79x = 99,731.46 × 54,396.58
4. Step 4: Simplify right side
   72,249.79x = 5,425,050,342.41
5. Step 5: Solve for x
   x = 5,425,050,342.41/72,249.79
6. Step 6: Final answer
   x = 75,087.42