Finding the Fourth Proportional to 173,287.98, 259,340.55 and 145,239.72

Step by Step Solution

1. Step 1: Write the proportion equation
   173,287.98 : 259,340.55 = 145,239.72 : x
2. Step 2: Convert to fraction form
   173,287.98/259,340.55 = 145,239.72/x
3. Step 3: Cross multiply
   173,287.98x = 259,340.55 × 145,239.72
4. Step 4: Simplify right side
   173,287.98x = 37,666,548,866.65
5. Step 5: Solve for x
   x = 37,666,548,866.65/173,287.98
6. Step 6: Final answer
   x = 217,363.89