Finding the Fourth Proportional to 85,429.33, 128,170.00 and 40,485.12

Step by Step Solution

1. Step 1: Write the proportion equation
   85,429.33 : 128,170.00 = 40,485.12 : x
2. Step 2: Convert to fraction form
   85,429.33/128,170.00 = 40,485.12/x
3. Step 3: Cross multiply
   85,429.33x = 128,170.00 × 40,485.12
4. Step 4: Simplify right side
   85,429.33x = 5,188,977,172.64
5. Step 5: Solve for x
   x = 5,188,977,172.64/85,429.33
6. Step 6: Final answer
   x = 60,739.99