Finding the Fourth Proportional to 172,405.40, 258,608.38 and 54,085.82

Step by Step Solution

1. Step 1: Write the proportion equation
   172,405.40 : 258,608.38 = 54,085.82 : x
2. Step 2: Convert to fraction form
   172,405.40/258,608.38 = 54,085.82/x
3. Step 3: Cross multiply
   172,405.40x = 258,608.38 × 54,085.82
4. Step 4: Simplify right side
   172,405.40x = 13,987,046,291.17
5. Step 5: Solve for x
   x = 13,987,046,291.17/172,405.40
6. Step 6: Final answer
   x = 81,128.82