Finding the Fourth Proportional to 172,728.72, 259,092.72 and 54,410.40

Step by Step Solution

1. Step 1: Write the proportion equation
   172,728.72 : 259,092.72 = 54,410.40 : x
2. Step 2: Convert to fraction form
   172,728.72/259,092.72 = 54,410.40/x
3. Step 3: Cross multiply
   172,728.72x = 259,092.72 × 54,410.40
4. Step 4: Simplify right side
   172,728.72x = 14,097,338,532.29
5. Step 5: Solve for x
   x = 14,097,338,532.29/172,728.72
6. Step 6: Final answer
   x = 81,615.49