Finding the Fourth Proportional to 256,498.70, 384,790.17 and 79,005.74

Step by Step Solution

1. Step 1: Write the proportion equation
   256,498.70 : 384,790.17 = 79,005.74 : x
2. Step 2: Convert to fraction form
   256,498.70/384,790.17 = 79,005.74/x
3. Step 3: Cross multiply
   256,498.70x = 384,790.17 × 79,005.74
4. Step 4: Simplify right side
   256,498.70x = 30,400,632,125.58
5. Step 5: Solve for x
   x = 30,400,632,125.58/256,498.70
6. Step 6: Final answer
   x = 118,521.58