Finding the Fourth Proportional to 128,300.05, 192,624.59 and 72,179.65

Step by Step Solution

1. Step 1: Write the proportion equation
   128,300.05 : 192,624.59 = 72,179.65 : x
2. Step 2: Convert to fraction form
   128,300.05/192,624.59 = 72,179.65/x
3. Step 3: Cross multiply
   128,300.05x = 192,624.59 × 72,179.65
4. Step 4: Simplify right side
   128,300.05x = 13,903,574,524.47
5. Step 5: Solve for x
   x = 13,903,574,524.47/128,300.05
6. Step 6: Final answer
   x = 108,367.65