Finding the Fourth Proportional to 256,258.82, 384,424.96 and 78,780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   256,258.82 : 384,424.96 = 78,780.72 : x
2. Step 2: Convert to fraction form
   256,258.82/384,424.96 = 78,780.72/x
3. Step 3: Cross multiply
   256,258.82x = 384,424.96 × 78,780.72
4. Step 4: Simplify right side
   256,258.82x = 30,285,275,134.77
5. Step 5: Solve for x
   x = 30,285,275,134.77/256,258.82
6. Step 6: Final answer
   x = 118,182.37