Finding the Fourth Proportional to 72,256.56, 99,748.16 and 54,358.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,256.56 : 99,748.16 = 54,358.40 : x
2. Step 2: Convert to fraction form
   72,256.56/99,748.16 = 54,358.40/x
3. Step 3: Cross multiply
   72,256.56x = 99,748.16 × 54,358.40
4. Step 4: Simplify right side
   72,256.56x = 5,422,150,380.54
5. Step 5: Solve for x
   x = 5,422,150,380.54/72,256.56
6. Step 6: Final answer
   x = 75,040.25