Finding the Fourth Proportional to 145,450.52, 217,724.72 and 78,725.15

Step by Step Solution

1. Step 1: Write the proportion equation
   145,450.52 : 217,724.72 = 78,725.15 : x
2. Step 2: Convert to fraction form
   145,450.52/217,724.72 = 78,725.15/x
3. Step 3: Cross multiply
   145,450.52x = 217,724.72 × 78,725.15
4. Step 4: Simplify right side
   145,450.52x = 17,140,410,574.93
5. Step 5: Solve for x
   x = 17,140,410,574.93/145,450.52
6. Step 6: Final answer
   x = 117,843.59