Finding the Fourth Proportional to 85,652.82, 128,427.20 and 42,908.54

Step by Step Solution

1. Step 1: Write the proportion equation
   85,652.82 : 128,427.20 = 42,908.54 : x
2. Step 2: Convert to fraction form
   85,652.82/128,427.20 = 42,908.54/x
3. Step 3: Cross multiply
   85,652.82x = 128,427.20 × 42,908.54
4. Step 4: Simplify right side
   85,652.82x = 5,510,623,648.29
5. Step 5: Solve for x
   x = 5,510,623,648.29/85,652.82
6. Step 6: Final answer
   x = 64,336.75