Finding the Fourth Proportional to 429,405.93, 644,190.71 and 173,258.82

Step by Step Solution

1. Step 1: Write the proportion equation
   429,405.93 : 644,190.71 = 173,258.82 : x
2. Step 2: Convert to fraction form
   429,405.93/644,190.71 = 173,258.82/x
3. Step 3: Cross multiply
   429,405.93x = 644,190.71 × 173,258.82
4. Step 4: Simplify right side
   429,405.93x = 111,611,721,403.27
5. Step 5: Solve for x
   x = 111,611,721,403.27/429,405.93
6. Step 6: Final answer
   x = 259,921.24