Finding the Fourth Proportional to 256,233.56, 384,584.72 and 129,960.99

Step by Step Solution

1. Step 1: Write the proportion equation
   256,233.56 : 384,584.72 = 129,960.99 : x
2. Step 2: Convert to fraction form
   256,233.56/384,584.72 = 129,960.99/x
3. Step 3: Cross multiply
   256,233.56x = 384,584.72 × 129,960.99
4. Step 4: Simplify right side
   256,233.56x = 49,981,010,300.27
5. Step 5: Solve for x
   x = 49,981,010,300.27/256,233.56
6. Step 6: Final answer
   x = 195,060.36