Finding the Fourth Proportional to 72,109.68, 99,538.73 and 54,256.59

Step by Step Solution

1. Step 1: Write the proportion equation
   72,109.68 : 99,538.73 = 54,256.59 : x
2. Step 2: Convert to fraction form
   72,109.68/99,538.73 = 54,256.59/x
3. Step 3: Cross multiply
   72,109.68x = 99,538.73 × 54,256.59
4. Step 4: Simplify right side
   72,109.68x = 5,400,632,062.73
5. Step 5: Solve for x
   x = 5,400,632,062.73/72,109.68
6. Step 6: Final answer
   x = 74,894.69