Finding the Fourth Proportional to 172,978.54, 259,502.83 and 73,138.57

Step by Step Solution

1. Step 1: Write the proportion equation
   172,978.54 : 259,502.83 = 73,138.57 : x
2. Step 2: Convert to fraction form
   172,978.54/259,502.83 = 73,138.57/x
3. Step 3: Cross multiply
   172,978.54x = 259,502.83 × 73,138.57
4. Step 4: Simplify right side
   172,978.54x = 18,979,665,065.55
5. Step 5: Solve for x
   x = 18,979,665,065.55/172,978.54
6. Step 6: Final answer
   x = 109,722.66