Finding the Fourth Proportional to 172,498.07, 258,659.60 and 78,923.63

Step by Step Solution

1. Step 1: Write the proportion equation
   172,498.07 : 258,659.60 = 78,923.63 : x
2. Step 2: Convert to fraction form
   172,498.07/258,659.60 = 78,923.63/x
3. Step 3: Cross multiply
   172,498.07x = 258,659.60 × 78,923.63
4. Step 4: Simplify right side
   172,498.07x = 20,414,352,878.43
5. Step 5: Solve for x
   x = 20,414,352,878.43/172,498.07
6. Step 6: Final answer
   x = 118,345.40