Finding the Fourth Proportional to 172,698.72, 259,047.72 and 54,380.40

Step by Step Solution

1. Step 1: Write the proportion equation
   172,698.72 : 259,047.72 = 54,380.40 : x
2. Step 2: Convert to fraction form
   172,698.72/259,047.72 = 54,380.40/x
3. Step 3: Cross multiply
   172,698.72x = 259,047.72 × 54,380.40
4. Step 4: Simplify right side
   172,698.72x = 14,087,118,632.69
5. Step 5: Solve for x
   x = 14,087,118,632.69/172,698.72
6. Step 6: Final answer
   x = 81,570.49