Finding the Fourth Proportional to 145,522.24, 200,817.72 and 85,128.64

Step by Step Solution

1. Step 1: Write the proportion equation
   145,522.24 : 200,817.72 = 85,128.64 : x
2. Step 2: Convert to fraction form
   145,522.24/200,817.72 = 85,128.64/x
3. Step 3: Cross multiply
   145,522.24x = 200,817.72 × 85,128.64
4. Step 4: Simplify right side
   145,522.24x = 17,095,339,391.50
5. Step 5: Solve for x
   x = 17,095,339,391.50/145,522.24
6. Step 6: Final answer
   x = 117,475.79