Finding the Fourth Proportional to 172,707.30, 258,623.55 and 137,715.30

Step by Step Solution

1. Step 1: Write the proportion equation
   172,707.30 : 258,623.55 = 137,715.30 : x
2. Step 2: Convert to fraction form
   172,707.30/258,623.55 = 137,715.30/x
3. Step 3: Cross multiply
   172,707.30x = 258,623.55 × 137,715.30
4. Step 4: Simplify right side
   172,707.30x = 35,616,419,775.32
5. Step 5: Solve for x
   x = 35,616,419,775.32/172,707.30
6. Step 6: Final answer
   x = 206,224.17