Finding the Fourth Proportional to 72,255.80, 99,747.09 and 54,357.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72,255.80 : 99,747.09 = 54,357.63 : x
2. Step 2: Convert to fraction form
   72,255.80/99,747.09 = 54,357.63/x
3. Step 3: Cross multiply
   72,255.80x = 99,747.09 × 54,357.63
4. Step 4: Simplify right side
   72,255.80x = 5,422,015,411.80
5. Step 5: Solve for x
   x = 5,422,015,411.80/72,255.80
6. Step 6: Final answer
   x = 75,039.18