Finding the Fourth Proportional to 259,904.72, 389,870.88 and 72,930.80

Step by Step Solution

1. Step 1: Write the proportion equation
   259,904.72 : 389,870.88 = 72,930.80 : x
2. Step 2: Convert to fraction form
   259,904.72/389,870.88 = 72,930.80/x
3. Step 3: Cross multiply
   259,904.72x = 389,870.88 × 72,930.80
4. Step 4: Simplify right side
   259,904.72x = 28,433,595,175.10
5. Step 5: Solve for x
   x = 28,433,595,175.10/259,904.72
6. Step 6: Final answer
   x = 109,400.07