Finding the Fourth Proportional to 172,915.89, 259,396.52 and 67,721.19

Step by Step Solution

1. Step 1: Write the proportion equation
   172,915.89 : 259,396.52 = 67,721.19 : x
2. Step 2: Convert to fraction form
   172,915.89/259,396.52 = 67,721.19/x
3. Step 3: Cross multiply
   172,915.89x = 259,396.52 × 67,721.19
4. Step 4: Simplify right side
   172,915.89x = 17,566,641,016.26
5. Step 5: Solve for x
   x = 17,566,641,016.26/172,915.89
6. Step 6: Final answer
   x = 101,590.67