Finding the Fourth Proportional to 256,626.88, 384,915.50 and 79,086.20

Step by Step Solution

1. Step 1: Write the proportion equation
   256,626.88 : 384,915.50 = 79,086.20 : x
2. Step 2: Convert to fraction form
   256,626.88/384,915.50 = 79,086.20/x
3. Step 3: Cross multiply
   256,626.88x = 384,915.50 × 79,086.20
4. Step 4: Simplify right side
   256,626.88x = 30,441,504,216.10
5. Step 5: Solve for x
   x = 30,441,504,216.10/256,626.88
6. Step 6: Final answer
   x = 118,621.65