Finding the Fourth Proportional to 256,617.81, 384,901.98 and 79,077.15

Step by Step Solution

1. Step 1: Write the proportion equation
   256,617.81 : 384,901.98 = 79,077.15 : x
2. Step 2: Convert to fraction form
   256,617.81/384,901.98 = 79,077.15/x
3. Step 3: Cross multiply
   256,617.81x = 384,901.98 × 79,077.15
4. Step 4: Simplify right side
   256,617.81x = 30,436,951,607.76
5. Step 5: Solve for x
   x = 30,436,951,607.76/256,617.81
6. Step 6: Final answer
   x = 118,608.10