Finding the Fourth Proportional to 72,443.50, 99,972.39 and 42,249.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,443.50 : 99,972.39 = 42,249.76 : x
2. Step 2: Convert to fraction form
   72,443.50/99,972.39 = 42,249.76/x
3. Step 3: Cross multiply
   72,443.50x = 99,972.39 × 42,249.76
4. Step 4: Simplify right side
   72,443.50x = 4,223,809,484.13
5. Step 5: Solve for x
   x = 4,223,809,484.13/72,443.50
6. Step 6: Final answer
   x = 58,304.88