Finding the Fourth Proportional to 256,411.52, 384,606.08 and 78,936.56

Step by Step Solution

1. Step 1: Write the proportion equation
   256,411.52 : 384,606.08 = 78,936.56 : x
2. Step 2: Convert to fraction form
   256,411.52/384,606.08 = 78,936.56/x
3. Step 3: Cross multiply
   256,411.52x = 384,606.08 × 78,936.56
4. Step 4: Simplify right side
   256,411.52x = 30,359,480,910.28
5. Step 5: Solve for x
   x = 30,359,480,910.28/256,411.52
6. Step 6: Final answer
   x = 118,401.39