Finding the Fourth Proportional to 258,915.56, 388,524.38 and 109,146.76

Step by Step Solution

1. Step 1: Write the proportion equation
   258,915.56 : 388,524.38 = 109,146.76 : x
2. Step 2: Convert to fraction form
   258,915.56/388,524.38 = 109,146.76/x
3. Step 3: Cross multiply
   258,915.56x = 388,524.38 × 109,146.76
4. Step 4: Simplify right side
   258,915.56x = 42,406,177,258.01
5. Step 5: Solve for x
   x = 42,406,177,258.01/258,915.56
6. Step 6: Final answer
   x = 163,783.81