Finding the Fourth Proportional to 85,408.99, 128,100.35 and 28,483.89

Step by Step Solution

1. Step 1: Write the proportion equation
   85,408.99 : 128,100.35 = 28,483.89 : x
2. Step 2: Convert to fraction form
   85,408.99/128,100.35 = 28,483.89/x
3. Step 3: Cross multiply
   85,408.99x = 128,100.35 × 28,483.89
4. Step 4: Simplify right side
   85,408.99x = 3,648,796,135.94
5. Step 5: Solve for x
   x = 3,648,796,135.94/85,408.99
6. Step 6: Final answer
   x = 42,721.45