Finding the Fourth Proportional to 85,760.50, 128,617.50 and 35,830.15

Step by Step Solution

1. Step 1: Write the proportion equation
   85,760.50 : 128,617.50 = 35,830.15 : x
2. Step 2: Convert to fraction form
   85,760.50/128,617.50 = 35,830.15/x
3. Step 3: Cross multiply
   85,760.50x = 128,617.50 × 35,830.15
4. Step 4: Simplify right side
   85,760.50x = 4,608,384,317.63
5. Step 5: Solve for x
   x = 4,608,384,317.63/85,760.50
6. Step 6: Final answer
   x = 53,735.51