Finding the Fourth Proportional to 85,429.47, 128,120.74 and 25,455.25

Step by Step Solution

1. Step 1: Write the proportion equation
   85,429.47 : 128,120.74 = 25,455.25 : x
2. Step 2: Convert to fraction form
   85,429.47/128,120.74 = 25,455.25/x
3. Step 3: Cross multiply
   85,429.47x = 128,120.74 × 25,455.25
4. Step 4: Simplify right side
   85,429.47x = 3,261,345,466.89
5. Step 5: Solve for x
   x = 3,261,345,466.89/85,429.47
6. Step 6: Final answer
   x = 38,175.88